How to do it: Begin on all fours, knees hip-width apart and under the hips, hands flat and shoulder-width apart. Squeeze your abs by pulling belly toward spine. Keep the spine neutral, without arching the back or rotating the hips, and extend your right leg back and your left arm straight ahead. Hold for two to three seconds or as long as you can maintain form. Repeat five to six times on each side.
What it does: This exercise improves muscle balance and coordination, making it easier to keep the spine stable for everyday moves, such as walking, running, dancing, and carrying a child. It also tones your glutes, upper back, lower spine, and hamstrings. Tighter abs also keep the spine supported.
Make it harder: Gradually increase the holding time for 10 to 12 counts. For an additional challenge, add movement to the mix by slowly lifting and lowering the extended arm and leg a few inches, maintaining proper form throughout.