Plank on extended hands with bending knees 15 times
This workout strengthens your abs and your hands, calves, shoulders, and legs.
Workout: How to make it correctly
Stand on a plank with all of your weight in your arms.
Pull your left knee up to your waist, bend it and hold it in that function for a few seconds.
Extend your leg returned and repeat this motion together with your proper leg.
