One thing I wish I realized earlier in regards to strength training: It's very easy to do at home if you have the space for it. You don't need an expensive machine. A used power rack and bench can be found for cheap. I now get my workouts done in the amount of time it would've taken me to drive to/from the gym. Listen to whatever music I like. Don't have to worry about other people. Don't have to worry about weather.
One can get pretty far with just a pull up bar and gymnast rings.
I don't have the best set up now. But my Walmart style iron gym pull up bar for my door, with gymnastic rings hanging on it, goes a long way. Sure, if I needed to progress further in the future, I would probably need more space for the rings, but it suits my workouts.
Hiking up mountains is for the leg workouts.