premise: The worst part is I slept on my stomach in some really weird position with my hands squished up under my ribcage , so I had this awful aching feeling under my chest above my tum tum . This made my morning sit ups totally impossible . I did about five and chucked that idea completely . Needless to say I feel like a big dumpy tub of lard today . What may have caused the aching feeling under your chest ?
hypothesis: My ribcage was squishing up against my chest .