1. Plank
Step 1: Get down into a push-up position with the legs straight back and your hands directly under your shoulders.
Step 2: Brace your abs and squeeze your glutes to stabilize your whole body. Bend your elbows 90 degrees and rest your weight on your forearms. Your elbows should be directly beneath your shoulders and your body should form a straight line from your head to your feet. Hold the position for as long as you can. Aim for 60 seconds if you can.
2. Side Plank
Step 1: Lie on one side with your legs straight. Prop up your upper body on your bottom forearm.
Step 2: Brace your core and raise your hips until your body forms a straight line. Hold this position for as long as you can while breathing deeply. Then roll over and repeat on the other side.
Make it harder: If you want to make it harder raise your top leg straight and hold it.
3. Push-Up
Step 1: Get down on your fours and balance your weight on your toes and palms with hands slightly wider than shoulder-width apart. Your body should form a straight line from your ankles to your head.
Step 2: Squeeze your glutes and brace your abdominals for the duration of the exercise. In one motion, slowly lower yourself to the floor, pause for 1-2 seconds, and push yourself back up to the starting position. Repeat 10-15 times.
4. Mountain Climber
Step 1: Start at the top of a pushup position, so your body form a straight line from your head to the back of your heels.
Step 2: Brace your abs. Pick up your right foot and slowly bring your chest, then return quickly to the starting position and switch legs. Continue alternating between your legs for 30 seconds.
5. Reverse Crunch
Step 1: Lie face up on the floor with your palms facing down next to your sides. Bend your hips and knees 90 degrees.
Step 2: Contract your abs and raise your hips off the floor. Crunch them inward. Pause 1-2 seconds, and then slowly lower your legs back down until your heels nearly touch the floor. Do 12-15 reps for 3 sets.