FK.UK: Garreth - Viewing Profile

I know there are a few threads about over-training however I do not think any give me the replies I am looking for.

From Moose's TROG:
"Went to the CF Strongman cert on Saturday and have been unable to train since!
Nerves in arms and shoulders are totally shot - very weird feeling. And painful. Tried some presses today and simply couldn't do it!!"

In a way it is similar to me over the last few weeks. I've gone to 7 kettlebell classes after being out of training for a few years. The first few weren't bad but the 5th and 7th left me unable to do much for days afterwards like Moose above.

Does this cause more harm than good in the long run? Can it damage muscles beyond repair?

I've been out of the loop a while and I was wondering what happened to Chet and FK.UK. The homepage is gone. This forum is still here but fairly inactive. He is not on his old haunt at Boditronics or at Crossfit.com. Has anything happened him? Anyone heard from him?