Okay sometimes i do serious lat pulls a little too close to my chest day and my pecs are sore at the top back corner, kinda close to my shoulders. In such a case, instead of lifting heavy (which i can't cause part of my chest got trashed) I do mad pushups, to complete failure. I do it so I get at least some workout instead of waiting another 4-7 days for that one little part of my chest to recover. The pumps are great, but does it really not build muscle? I find that difficult to believe.

Also, am I doing my lats wrong?