Please choose the correct solution to the question: How to do planks properly at home.

Solution1: Lie face down in a push-up position. Keep your palms on the floor next to your shoulders and your feet flexed with the bottoms of your toes on the floor. Take a deep breath and press up into a push-up. Your body should make a straight line from your heels to the top of your head. Draw your navel toward your spine and tighten your buttocks. Look at the floor to keep your head in neutral position and breathe normally. Hold for at least 10 seconds and lower yourself back to the floor.

Solution2: Lie face down in a push-up position. Keep your palms on the floor next to your shoulders and your feet flexed with the bottoms of your toes on the floor. Take a deep breath and press up into a push-up. Your body should make a straight line from your heels to the top of your head. Draw your navel toward your spine and tighten your buttocks. Look at the ceiling to keep your head in neutral position and breathe normally. Hold for at least 10 seconds and lower yourself back to the floor.

Answer format: solution1/solution2