I had certain circumstances that kept me away for training for long periods over 2 years. My body weight did not go down much and I did not lose a whole lot of muscle, but enough, especially from my arms and shoulders. Waist went out a bit. When I started training again, slow and steady, the strength and tightness cam back fairly quick... like within 2 months. I don't know why I rebounded so quick, it might have been that I have been athletic all my life and I always pushed my mind and body hard. I guess every one has different experiences with muscle loss. however training for me is more for mental health and strength than muscular size. The gaining of strength and the effort you have to put into is hard and I enjoy that... it makes me feel good ... alive.