Straddle Donkey Kick

The Straddle Donkey Kick is a mobility exercise that targets the glutes and the medial glutes to hold the body line during a full straddle planche.

Begin lying on your stomach on top of a box and place your hips on the edge so that your legs hang off.
Lift both legs up, keeping them straight and bring them as far sideways as possible.
Leave your right leg suspended and return your left leg back to the starting position.
Extend your left leg back out, switch sides, and continue to alternate for reps.
To ensure that you're achieving full range of motion; feel your knees straighten and quads engage each time your foot reaches hip height.
Prior to lowering the single leg back down, be sure both of your legs are parallel to the floor and you've achieved your widest straddle.