Muscular atrophy is something anybody can avoid. I convinced my 64 years old dad to start training earlier this year and I bought him the perfect gift for Christmas: a 35lbs kettlebell. Going to the gym is not exactly his idea of a good time and he likes to keep his sessions short. He is ready to invest 2 days / week on his health and has been consistent so far. He started to work on body weight exercises before, but the kettlebell, even just for the swing, is a major add on to his routine and will shorten his sessions even more.