"Push-Up Plank Hold: lower yourself into the bottom of a push-up and hold there, chest a few centimetres off the floor with your elbows bent at about 90 degrees and tucked back rather than flared. "
As I understand it, the 90° is more about how deep to go, and keeping the elbows tucked instead of flared is about keeping them at 45°
As I understand it, the 90° is more about how deep to go, and keeping the elbows tucked instead of flared is about keeping them at 45°