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Plank knee twist

Primary muscles: Abs, glutes, hamstrings.

Adjust your speed based on your ability in order to maintain good form throughout the exercise. Ensure that you do not raise your bottom – your body should stay aligned flat in the plank.

Plank Knee Twist 11. Get into a full plank position (the “up” part of a push-up with your hands flat on the ground) or a modified plank position (same as full but with elbows on the ground instead of hands).

Plank Knee Twist 3 

2. Twist your lower body to the right, swinging your right knee under your abs to complete the twist toward your left elbow.
Plank Knee Twist 2
3. Twist back to center, replacing your left foot next to your right. Then repeat with the right side of the body.