These simple moves will help you strengthen your core and increase flexibility — without breaking a sweat.
Stand with your feet hip-width apart with your arms at your sides. Take a step forward so that your feet are a few feet apart, with your front right heel in line with the arch of your back left foot. Point your right foot forward and keep your left foot perpendicular to it. Raise your arms over head and then twist away from your right front leg, lowering your right arm out in front of you, and your left arm straight back behind you at shoulder height.
Start in a standing position. Bend your knees and hinge at the hips, like you are sitting back into a chair, until your thighs are parallel to the ground. Raise your arms straight up by your ears, framing your head. Your arms and torso should be in a straight line from your hips to your fingertips and your knees should not go past your toes. Hold this position for 10 seconds, pulling your belly button in towards your spine.