I’ve been reading hiking trail journals and notice that many hikers begin at age 50-65 with no prior hiking or fitness experience. Most are worried they won’t be strong or fit enough to walk 10+ miles a day for weeks with a 20-40 lb backpack but notice they gain strength and endurance every day on the trip. I’m doing that at the gym, plodding ahead, one foot in front of the other, going thru the paces to get it done and find for me that’s the way to do it. I can tell I’m getting stronger when it’s easy to move furniture and pull my weight up into the tree.   I didn’t begin working out in the gym until I was over 50. I’ve done daily yoga since age 18 but only in 2005 did I start doing weights and getting aerobic. It’s never too late to start.