If sit-ups are still the go-to core drill at your athlete’s practice, it’s time for an upgrade. Traditional sit-ups do work the rectus abdominis, but they also heavily recruit the hip flexors and load the lumbar spine with repeated flexion, while doing little to build the anti-rotation stability and power transfer that sport actually demands. The seven exercises below come from sports medicine guidance and functional strength coaching, and each one trains the core the way it’s actually used on the field: bracing under load, resisting rotation, and transferring force from the ground up through a moving body.
Add them to a youth training plan and the payoff shows up in speed, agility, and durability — along with less wear on a growing spine than a steady diet of crunches offers. Below you’ll also find the age at which kids are typically ready to start, how often to train, a sample weekly routine, and the mistakes that undo most youth core programs.
Quick Answer
Young athletes get more out of core exercises that train stability, anti-rotation, and force transfer than they do from sit-ups. The seven best options are the hard-style plank, dead bug, bear crawl, Pallof press, bird-dog, single-arm farmer’s carry, and rotational medicine ball toss.
Most kids can start the bodyweight versions around age 6-8, once they can follow coaching cues and hold basic positions with control, adding light loaded versions once technique is solid. Two to three sessions a week of about 10 to 15 minutes each is enough — core training is not a muscle group that improves by doing more and more of it.
Why Sit-Ups Fall Short for Sport
The core isn’t just the abs — it’s the diaphragm, pelvic floor, deep spinal muscles, obliques, and glutes working together as a unit. Sit-ups only load a small slice of that system, and they do it through repeated spinal flexion, a pattern that compresses and decompresses the spinal discs with every rep and rarely shows up in athletic actions. Sprinting, cutting, jumping, and throwing all require the core to resist movement and transfer force, not curl forward.
Sit-ups also lean heavily on the hip flexors, which attach directly to the lumbar spine. When those muscles stay tight from overuse, they tug on the low back and can contribute to the kind of discomfort that sports medicine clinicians now steer young athletes away from. That’s part of why branches of the U.S. military dropped sit-ups from fitness testing in recent years — the movement puts a lot of spinal stress on the body relative to the functional, anti-rotation strength it builds.
Sports medicine guidance increasingly favors replacing sit-ups with exercises that challenge the core to stabilize against real-world loads. The goal is whole-body movement efficiency, not isolated muscle endurance — a plank or dead bug done correctly builds more usable strength than a set of thirty rushed sit-ups, with far less risk of aggravating a young, still-developing spine.
The 7 Core Exercises to Use Instead
1. Hard-Style Plank. This isn’t passive resting on your elbows — it’s an active full-body brace. Dig your toes into the ground, pull your elbows toward your feet without letting them move, squeeze your glutes hard, and drive your hips into alignment. Ten to thirty seconds done right beats a minute of lazy planking, and it teaches the core to generate full-body tension, the foundation of every explosive athletic movement.
2. Dead Bug. Lie on your back with arms pointing straight up and knees bent to 90 degrees. Slowly lower your opposite arm and leg toward the floor while keeping your lower back pressed flat, then return and switch sides. The dead bug targets the deep stabilizers — particularly the transverse abdominis — at the end range of motion where athletes are most vulnerable to injury.
3. Bear Crawl. From a hands-and-knees position, lift your knees just an inch off the ground and move opposite hand and foot forward in a slow, controlled crawl. The bear crawl demands rotary stability — keeping the spine neutral while limbs move in alternating patterns — which maps directly to running mechanics, wrestling, and nearly every field sport.
4. Pallof Press. Anchor a resistance band or cable at chest height. Stand sideways to the anchor, hold the band at your sternum with both hands, then press straight out in front of you and hold before returning. This is anti-rotation training at its purest and one of the fastest ways to build the lateral stability that helps protect the knees and hips during cutting and landing.
5. Bird-Dog. Start on hands and knees, with your hands directly under your shoulders and your knees under your hips. Keeping your spine neutral and core braced, extend your right arm and left leg out straight, hold briefly, lower with control, and alternate sides. This challenges balance and contralateral coordination — the same cross-body pattern used in sprinting — while building endurance in a neutral spine position.
6. Single-Arm Farmer’s Carry. Pick up a single dumbbell or kettlebell in one hand, stand tall, pull your shoulder blades back, and walk with controlled posture, resisting the urge to lean toward the weight. Carrying a load on one side forces the core to fight lateral bending with every step, which translates directly to single-leg stability in sport.
7. Rotational Medicine Ball Toss. Stand in a quarter-squat stance with a light medicine ball. Load the ball back toward one hip, then drive your hips and torso to sling the ball into a wall or to a partner, letting your arms follow through in a whipping motion. This trains force generation from the hips through the core to the arms — the exact chain used in throwing, swinging, and striking sports. Start light and focus on hip drive rather than arm strength.
As a general dosage guide for all seven moves, aim for one to three sets of 6 to 15 controlled reps (or 10 to 30 second holds for the plank, dead bug, bird-dog, and Pallof press), with enough rest between sets to reset good form rather than grinding through fatigue.
Signs a Young Athlete Is Ready for Core Training
Age is a rough guide, not a hard rule. Coaches and pediatric sports medicine clinicians look for readiness markers instead: the ability to follow a multi-step verbal cue without demonstration, enough balance to stand on one leg for several seconds, and enough body awareness to hold a basic plank or bird-dog position with a flat back rather than a sagging or piked one.
A child who is already participating in organized sport practice — soccer, gymnastics, martial arts, or similar — has usually already cleared this bar, since those activities demand the same following-directions and balance skills. If a child can’t yet hold a 10-second plank with reasonable form, that’s not a reason to skip core work; it’s a reason to start with easier regressions, like a plank from the knees, and build up.
What Age Should Young Athletes Start Core Training?
There’s no strict age cutoff — pediatric sports medicine and strength-and-conditioning guidance focuses on readiness rather than a specific number. The National Strength and Conditioning Association and other youth training organizations generally place that readiness window around age 6-8, the age at which most children have the balance, postural control, and attention span to follow coaching cues safely.
Bodyweight patterns like the dead bug, bird-dog, and bear crawl are appropriate starting points at that age. Loaded moves — the single-arm farmer’s carry with a light dumbbell, or the rotational medicine ball toss with a 1-2 pound ball — should wait until a child has demonstrated solid control of the unloaded version first, then progress gradually under supervision rather than jumping straight to adult-style loads.
How Often and How Long Should Sessions Be?
Two to three sessions a week, on non-consecutive days, is the standard recommendation from youth strength-and-conditioning guidance — and it’s plenty. Each session only needs to run about 10 to 15 minutes: a short dynamic warm-up, then two or three rounds through a handful of the exercises above.
Resist the urge to do core work every day or to chase exhaustion. As sports medicine clinicians who work with adolescent athletes point out, the core isn’t a “more is better” muscle group — it’s meant to switch on and off appropriately for the task at hand, not stay maximally contracted around the clock. A couple of focused, well-coached sessions a week build more durable strength than daily marathon ab circuits, and they leave room for the sport practice and recovery that matter just as much.
Sample Weekly Core Routine
A simple two-day split covers all seven exercises without overloading any single session. Day A: hard-style plank, dead bug, and single-arm farmer’s carry — 2 sets each, resting about a minute between sets. Day B: bird-dog, bear crawl, Pallof press, and rotational medicine ball toss — 2 sets each, with the same rest pattern.
Run Day A and Day B on two or three non-consecutive days (for example, Monday and Thursday, adding a lighter third day if the schedule allows), either as a stand-alone 10-15 minute block or tacked onto the end of a regular practice warm-up.
Common Mistakes to Avoid
Letting sit-ups creep back in. Coaches default to sit-ups because they’re familiar and need no equipment — but swapping even one of the seven exercises above into warm-ups removes the spinal flexion load without adding any cost in time or gear.
Chasing longer holds instead of better form. A 15-second hard-style plank with a braced, aligned body builds more strength than a sagging 60-second hold. Form should set the ceiling on time or reps, not the other way around.
Holding the breath. Kids often brace by holding their breath through a rep, which spikes intra-abdominal pressure in an uncontrolled way. Cue steady breathing — exhale through the hard part of the rep — from the first session.
Skipping the warm-up. A short dynamic warm-up primes the nervous system for the stability demands of these exercises and reduces the odds of a tweaked low back or hip on a cold first rep.
Training the core in isolation. True athletic core strength works together with the glutes, hips, and shoulder girdle. Pairing core work with general strength and movement training — rather than treating it as a separate ab routine — carries over to sport much better.
core exercises for young athletes FAQs
Is it harmful for kids to do sit-ups occasionally?
An occasional sit-up isn’t going to injure a healthy child. The concern is relying on sit-ups as the primary or daily core drill, since the repeated spinal flexion and hip-flexor dominance offer little athletic carryover compared to stability-based alternatives.
What age can my child start doing planks?
Most kids can start a basic plank, held from the knees or toes for short bouts, around age 6-8 once they can follow a coaching cue and hold the position with a flat back. Readiness matters more than the exact birthday.
How many days a week should young athletes do core exercises?
Two to three non-consecutive days a week is the standard recommendation, with each session lasting roughly 10 to 15 minutes. Core training doesn’t need to happen daily to be effective.
Do young athletes need weighted core exercises, or is bodyweight enough?
Bodyweight versions of these exercises are enough for most young athletes, especially early on. Light loads — a single dumbbell for the farmer’s carry or a 1-2 pound medicine ball for the rotational toss — can be added once bodyweight technique is solid, but heavy loading isn’t necessary for the core-stability benefits these moves provide.
Can core training actually improve speed and agility?
Yes — a core that can brace and resist unwanted movement lets an athlete transfer force from the ground through the hips and into a sprint stride or cutting step more efficiently, which is why anti-rotation and stability work shows up in speed and agility programs, not just injury-prevention plans.
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