Trainer tip: You know planks, right? It’s easy to go through the motions here. Don’t do it. “The key is to squeeze your entire body—quads, glutes, core, back, and fists—as tight as possible while taking diaphoretic breathes throughout the hold,” says Wealth. No matter how many times you’ve done it, this exercise is as difficult as you’re willing to make it.
To do it: Start seated, then lean back, resting your weight on your forearms (bending your elbows behind your body, fingers facing forward). Extend both legs straight out in front of you. Bend your right knee into a ‘passé position’ by pointing your right foot and pressing the inside edge of your right foot along the inside of your left knee. Draw your abs in tight and lift your legs off the mat and towards the chest (maintaining passé position). Bring your right knee all the way up to the right side of your chest and then lower your legs (still in passé) back down, about two inches from the floor (or as low as you can). Repeat 8 times and then switch legs. Try to do 8 reps on each side, for up to 2 sets.
The Torso Track comes out as number 5 for effective ab exercises, but this is one of my least favorite exercises because it can cause lower-back pain, particularly if you roll out too far. In fact, in the ACE study, researchers found that a significant number of subjects reported lower-back pain, so you may want to skip the expense, and discomfort, of this one and choose other exercises that can target the abs with equal effectiveness.
To do it: Stand with your feet planted 3-4 feet apart, toes slightly turned out, hands on your hips. Lower into a plie by bending your knees out over your toes and lowering your hips directly underneath your shoulders. Then, as your straighten back up, slowly lift the right knee up towards the right shoulder. As you go back into the plie, slowly return the foot to the floor. Be sure to move at a very controlled pace to really engage the obliques the entire time—on the way up and on the way down. Do 10 repetitions on the right side, then another 10 repetitions on the left side for a total of 20. 

best ways to build core

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