I have never wanted to work out INSIDE in a gym so I just hike and trail run to stay in shape. Just got back from the Dacks with Baxter where we tried to do the entire great range with full packs. This will get you in shape and you won't have a choice. After having to bail due to weather we hitched a ride up to A.D.K. Loge and the next day I headed up to Marcy. My wife was coming at 1:00 to pick us both up so I decided to leave the parking lot at 8:30 and try to make Marcy and be back down by 12:30. The round trip is around 12 miles. I quickly found out I was not in the shape I thought I was. I made it as far as 1.2 from the summit but had to turn around so I could be back out in time to be picked up. These are the things that I have done to keep me in some what of shape. I guess what I am saying is you just have stay active. Being inactive is what will do you in.