Plank Start on your stomach and push yourself onto your forearms and toes. Brace your stomach and glutes and make a straight line from your ankles to your head. Hold for at least 30 seconds. Each workout, try to hold the plank a little longer. You should feel this exercise in your abs, thighs, and shoulders. If you don’t feel this exercise in those places, make sure you’re not letting your hips sag and that your body is in a straight line. Side Plank Start on your right side. Support yourself with your right forearm and the side of your right foot. Keep a straight line from your feet to your head. Don’t let your hips sag. Hold for at least 30 seconds. Repeat on the left side. You should feel this exercise in your back, side, and shoulder. Bicycle Crunch Start on your back with your knees bent at 90 degrees and your feet in the air. While crunching your upper body, extend your left leg and touch your right knee with your left elbow. Repeat on the other side and perform at least 10 crunches on each side. You should feel this exercise if your abs and obliques (sides of your abs). Flutter Kicks Lie face up on the floor or a mat with your feet straight in front of you. Lift your heels a couple inches off the ground and push your lower back flat into the ground. Keeping your back flat against the floor, lift one foot about 12 inches above the ground. Slowly switch your feet and continue to repeat for at least 10 reps on each side. You should feel this exercise in your abs with an emphasis on your lower abs above your pelvic bone. Side to Side Flutter Kick Set up in the same way as the regular flutter kicks. Instead of moving your feet up and down, move them side to side. Spread your feet about 24 inches apart with your heels still about 2 inches above the ground. Cross your feet with your right foot on the bottom. Each time you repeat, switch the foot on the bottom. You should feel this exercise in your abs and obliques (the sides of your abs).