Quote:
Originally Posted by Cynic
And I was going to make some joke comment about putting a board with nails under them...and you bring up a different plank. 
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hahahah, classic!
Sagging hips most likely weak hip flexors. Try leg raises and planks for a month, bring those up and retest the pushup.
Also, make sure your client is strong enough to do a pushup. If they aren't, they are going to spend so much time and concentration pushing that they are not going to flex the hip to keep the ass up. If this is the case, then switch to BB or DB flat presses and get their upper pressing in check.
If your client can't press 60% of their bodyweight then they are going to have a bitch of a time with pushups. For example, if you have an overweight male that is 250lbs and he can't press 150lbs on a close to medium grip bench press, then he is probably not going to be able to do a pushup. If he can press that weight or more, then it's definitely the hips and abs, and quite possibly the quads as well.