Yep get into the natural foods for sure. Drink lots of water. I don't know what type terrain you have where you live, but where I do I very rarely hit the gym. When I was that age it was waterskiing swimming biking, or just hiking with my hunting pack on.I was lucky to grow up with parents that invested in a Home on lake front proerty. I got a little more invested I bought a kayak. Runnng doesn't do a heck of alot to help out.Now with famlly and work in the way of everything and don't have alot of time to train, a P90X an hour a day 7 days a week or bootcamp an hour a day 5 days a week will get you there.Especially bootcamp.This works you out huge and it's amazing the results you get in a month, over anything else.My wife is an instructor, it ain't just for fat folks. LOL . This training is alot of the same training pro athletes use in their dryland, but modified to suit their
conditioning. But if you are fit , their is no excuse, go high impact. You will have to change your diet increase your callorie intake but you will notice a difference fast.You will be able to ascend and descend with a 80 lbs pack forever.