Lay flat on your back again for this one but this time, place a dumbbell between your feet with your knees completely bent and thighs pointing straight up. Hold on to the dumbbell with your feet and bring your legs up toward your chest making sure your lower back gets off the ground. Focus on using your abs to pull your legs up and not getting momentum from your knees or feet.
Progressive overload with bodyweight training is different. You don’t want to increase your body’s weight (unless you want to get fat). You can increase the number of reps you do (up to a point) but it’s only a temporary strategy because you’ll see that if you train for a while, the number of reps you can do for each exercise will soar rather quickly.
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.