Build your core strength with the classic situp.
Situps target your core strength and abdominal muscles and help you build stability that is used across all exercises.
Begin with your feet flat on the ground, legs bent, and back and shoulder blades against the ground. Position your feet under a stabile weight or situp pad.
Keep your hands behind your head or even with your ears. Tighten your core and lift your chest up towards your knees, making a "v shape" with your knees and upper body.
Slowly lower your upper body back to the starting position, ensuring that your shoulder blades start fat against the ground.