can someone explain something to me. I'm not new to weight training and I had put in 15 years. I also put up some impressive lifts going up over 550 lbs and squats. I stopped working out for 10 years due to a marriage divorce and raising kids as a single father. Now I'm back in the gym and I'm already up to 300 lb on the bench and close to 400 lb on the squat. How am I gaining so fast after taking so long off?