im not losing it im serious on friday while walking i was rubbing my chest muscle because they were sore after my chest routine the day before and i began to notice a creaking sound like that of a loose floor board,i could hear and feel this,was it my muscle tendons healing from my workout the day before? i asked my brother to place his hand on my chest muscle and he thought it was my top making the noise,so i took of my top and we could still both feel and hear the tendons creaking..its gone today so im sure it was my muscle repairing itself is this normal like??