Frog Planche

Start in a push-up position with your hands shoulder-width apart and your feet together.

Bend your elbows and lower your body towards the ground, keeping your back straight.

As you lower your body, lift your feet off the ground and bring your knees towards your chest.

Hold this position for a few seconds, then extend your legs back out and push yourself back up to the starting position.

Repeat for the desired number of repetitions.

Recruiting larger muscle groups to "help" move the weight instead of isolating Abs — swinging momentum or shifting the torso takes tension off the muscle this exercise is meant to train.

Flaring the elbows too wide or letting the hips sag/pike, which shifts load off Abs and stresses the shoulder joint.

Rushing through reps using momentum rather than controlling both the lifting and lowering phase, which is especially important since there's no external load to force good tempo.

Attempting this exercise before building sufficient base strength and control — it has a low margin for error, so technique breakdown under fatigue is a common cause of injury.