It’s hard to judge the shape of your own plank, so getting input from a fitness trainer might be useful. — dpa
Doing the plank is not a complicated exercise, but getting it exactly right is important if you want to build up your core strength.
For a forearm plank – often considered the most common form to do a plank – lie on your stomach, rest your forearms on the floor, put your feet up, lift your pelvis, then hold.
