plank jacks 1/ Start on your toes and hands with your arms straight, back flat and your feet together. 2/ Jump your feet out to the sides without moving your hand position. Immediately jump back to the middle and repeat. Keep your back flat throughout.
These are great for the quads. Don't forget to control the movement to avoid bouncing, which puts pressure on your joints.
1/Stand upright with your arms in front at shoulder height.
2/ Lower your body toward the ground, keeping your back straight but coming on to your toes and lowering your hands to the sides of the feet. Return to start position and repeat.
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