2. Plank side-to-side feet jump and tuck
Time: 20sec Rest: 10sec
Why: It works your upper and lower abs, as well as your obliques (side abs).
- Start in the top of the press-up position, then jump your feet forwards so your knees come towards your hands.
- From there kick your legs back and to one side, then bring your knees back into the middle and then out to the other side.
- Focus on keeping each jump smooth while maintaining tension on your working muscles.