I agree legs are key.  

I'm a fan of doing squats to build/maintain my legs.  In addition, there is a weight machine I use where you sit, but it's like a squat in that your legs are pushing against flat panel that is attached via cables to weight.  I like this machine because I can work my calf muscles by pushing with the balls of my feet, or "tip toes" if you like.  

Snow_dog: thoughts?

prouboy