I’m now 4 months post op and back in the gym like nothing happened. I weight train 4/5 times a week always have done. I found weeks 6-12 fine in the gym bit a few moves where my chest became involved felt uncomfortable so I stopped. Start with light weights again like ur a beginner and increase if it feels ok to. Things like lat pull downs felt weird for a while and shoulder press. I’m not sure I would have been doing a mud run or assault course type thing at 10/12 weeks post op. Upper body will be very weak, but everyone’s recovery is different and it is hard to tell. Best advice is to take it slow and build up your weights.