Plank Variation: Plank Leg Lift ... Do three sets of 10 reps alternating arms, resting for 30 seconds to one minute between sets. Lauren Mazzo was the senior fitness editor at PS.

Start in full plank position. Lift one leg and pull your knee toward the opposite elbow. ... Continue alternating sides for 20 to 30 seconds, or as long as you can maintain proper form.

I say this because a handful of these moves were essentially supersets — with the likes of a reverse plank alternating single-leg bend and extend, or the side-lying leg lift, followed by an ...

Lift right leg straight back and up, keeping right foot firmly flexed. Bring right leg back down to mat, then repeat the move on left leg. Continue alternating legs for 30 seconds.

Reverse plank alternating single leg bend + extend; Pilates 100; Forearm plank body saw + alternating leg lift; Three-point scoop + side leg kick (right) Side-lying leg lift + oblique crunch (right) ...