What exercises can I do to flatten my stomach quickly?

1. Crunches: Lie on your back with your knees bent and feet flat on the floor. Place your hands behind your head and lift your shoulders off the floor. Hold for a few seconds and then lower your shoulders back down. Repeat for 10-15 reps.

2. Plank: Get into a push-up position, but instead of resting on your hands, rest on your forearms. Hold this position for 30-60 seconds.

3. Bicycle Crunches: Lie on your back with your knees bent and feet flat on the floor. Place your hands behind your head and lift your shoulders off the floor. Bring your right knee up towards your chest and then straighten your right leg out while bringing your left knee up towards your chest. Alternate legs for 10-15 reps.

4. Russian Twists: Sit on the floor with your knees bent and feet flat on the floor. Lean back slightly and lift your feet off the floor. Twist your torso from side to side for 10-15 reps.

5. Mountain Climbers: Get into a push-up position and then bring your right knee up towards your chest. Return to the starting position and then bring your left knee up towards your chest. Alternate legs for 10-15 reps.