This is the basic shape that is crucial for most of the exercises to come.
Begin on your back with your legs straight and your arms extended overhead.
Actively press your lower back into the floor and draw your belly button into your spine.
Inhale to slowly lift your shoulders, arms, and legs off the floor. Keep your hands and heels as low to the ground as possible, while still pressing your lower back into the floor. Maintain tight abs and glutes. It's OK to bend your knees if straight legs are too challenging.