Target your abs and core with the suspended plank with knee tuck.

How to
a.    Extend the straps and place your feet in the foot loops. Walk your body out until it is completely extended in a plank position.
b.    Keep your hips in line with your shoulders.
c.    Go into a straight-arm plank and engage your core.
d.    Bring your knees towards your chest and return to the back – repeat this.
e.    Build up your strength by focusing on technique, not speed.
f.    Alternate these with single-knee tucks in a running motion, keeping your hips up and body straight at all times; don’t let your back sag or drop your hips.

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