Hi Cherrios; My personal feeling on it is we have 1 body that needs to last. I over trained in my 20's and I'm paying for it now (I'm 35). I also believe anything to excess isn't healthy and could be a symptom of something else that's going on. I wasn't diagnosed with bipolar until I was 31 and prior to being diagnosed/on medication I took most things to the extreme. For me it was a symptom of the disorder. Keeping excessively busy allowed me to stuff my feelings and somewhat quiet my mind.

Only you can decide what is healthy for you and if you're concerned that you may have bipolar I would recommend speaking to a Psychiatrist.