
The seal jack is a jumping jack where the arms open and close horizontally in front of you.
Stand with your feet together, arms straight out in front of you at shoulder height, palms facing each other.
Jump while spreading your feet and opening your arms to the sides, then jump again to return to feet together while clapping your hands in front of you.
Stay on the balls of your feet with soft knees.
Image and text: Bryl Lim / Everkinetic — recoloré et rastérisé — CC BY-SA 4.0, via Workout Guide. Original entry