The Plank is a great workout you can do at home or in the gym that will give you a strong core. Lie facedown on a mat. Bend your arms and position your elbows beneath your shoulders, with your fisted and touching the mat. Lift your hips from the ground, supporting your body weight between your forearms and your toes. Hold this position for two to four sets of 20 to 30 seconds each. If you can make it to the one-minute mark, go for it!