bad posture or ur surface is hard.
try to add padded or cushion.
get a yoga mat or something as cushion.

asian gals have this conception that muscle=ugly.
they want normal size as in not fat not skinny.
haiz... i asked many gals too. all also say dont like muscle... zzz

when comes to mat salleh, they excited la.
we asians, they think tak boleh.
they all want those guys like the korean singers/dancers.
wtf... =.=
hahahaha... thats what malaysian gals are looking for in general.
those pop idols type...