Planks strengthen your core. Start with a pushup on your balls with your forearms on the floor. Core activation prevents slouching. Plank for 30–60 seconds.
Russian twist follows. Sit on a mat to start this core-strengthening exercise. Bend both knees, draw your core into your spine, and lean back a few inches with a straight back.
Hold both hands in front of your chest and twist your upper body to the left and right to accomplish one rep. Continue twisting.
Bicycle crush when resting down. Lift your legs toward your chest like you're riding a bike with both hands beside your head. Repeat on the opposite side.
Mountaineers start on a high plank with wrists below shoulders. Stand up straight. Repeat with your right knee after bringing your left knee to your chest.
Scissor kicks require a flat back. Use your hands for support. Next, elevate both legs off the floor and alternate moving them up and down like a scissor.
Reverse crunches include lying on your back. Kneel and raise. Reverse crunch by bringing your knees above your head.
Dead bugs conclude this list. Lay down. 90° arms and legs. Lower left arm and right leg simultaneously. Start again with right arm and left leg.