Quote Originally Posted by OakLeaf View Post
I think as long as you don't bring your elbows behind your spine, you're okay (provided you aren't sinking into your shoulders, which should be avoided anyhow). That isn't always going to be 90°, depending on your hand position and radius/humerus ratio. When we do fitness testing in our gym, we have the participant touch their chin to our fist, held vertically so the little finger's on the floor and their chin touches our thumb - that's about 4" off the floor. But maybe one of the PTs will weigh in on this?
Okey-dokey, a good reason for large boobs and doing PUs bra-less!