Your chest, right knee and butt/hamstrings are killing you because you spent yesterday climing up and down your left wing too many times to count, kneeling down with all the down hill pressure on your right knee and the fuse/canopy rail's sharp sides digging into your chest for 2 hours while you were bent over and stretched out removing those darn screws and panels and otherwise working on your fuel selector valve, fuel tubing and other under pilot seat area stuff...