I jumped up big miles this summer with no major issues to my muscles. I'm currently only skiing and doing a single 25 mile ride each week. My muscles could do a century if I asked, it's the butt, upper back, and knees that need some more time.

I strained the connection of the biceps femoris, a hamstring muscle, its extremely close to where you'd have ITB pain. My orthopedic doctor was able to tell me the difference and give me a shot in the right one. That gave me 2 months of relief, while I worked on resting it. Self massage and compression sleeve also help. I don't expect it get dramatically better anytime soon, I am trying to keep it from getting worse.

I say this because it's often misdiagnosed as ITB by people when jumping up big on the miles.