I just got outta the Marine Corps not to long ago. Was in for 12 years. While in I started lifting weights. I love it now, helps stop stress in its tracks. But while I was in Okinawa Japan I started to do some light MTBRing. Now back in my native California with a lot more hills and stepper terrain, I'm finding that I don't have very much endurance. I can pretty much lift all day in the gym then go home and pick my house up off it's foundation (just kidding) but put a couple of hills in front of me and I become a bag of sand. So my question is anyone here lift (to build) and also MTBR? How did you overcome your lack of endurance? I just don't want to be a sand bag on the trails. Thanks.