Exercises from the community
Crunches: Knees Up (abs)
Crunches: Knees Up keeps the legs elevated and hips flexed, which holds tension on the upper abs through the entire rep instead of letting it ease off between reps. Lie on your back with your knees bent and lifted so your shins are roughly parallel to the floor. Curl your shoulders and upper back off the floor toward your knees, then lower back down slowly without letting your feet drop.
Toe Touches (abs)
Toe Touches use your body's own leverage against gravity as resistance, targeting the lower abs for a chiseled result. Lie on your back with legs raised straight up toward the ceiling. Curl your shoulders off the floor and reach both hands up toward your toes, then lower back down with control without letting your legs drift or your lower back arch.
Thunderbolt Pose (Vajrasana)
Kneel and sit back on your heels with the tops of your feet in contact with the floor. Your soles will stretch and curve into a good arch underneath you. Keep your big toes and heels together so there is no gap or space between the feet. If the front of your ankles are not flexible enough to rest comfortably on the floor without a space, use a small towel rolled into a tight tube shape to place underneath, and gradually use smaller cloths until you no longer need this prop. Sit with your back and spine straight but not tense. Let your spine lengthen upward without forcing it. Imagine a string attached to the top of your head up to a bunch of helium balloons. On your breath inhale relax and balance, then on the exhale allow your spine to lengthen and straighten, stretching gently upward. Aim to stay in this position for 5 minutes. If this is uncomfortable or you experience "pins and needles," you probably need a larger rolled towel beneath the front of your ankles.