Naw, you need a good PT person. Hard to find, but gold. IME you're not really seeing burnout. You are seeing the result of just doing one thing. I've kept going by mixing it up: bike, run, hike, weights, ski, core, etc. I mostly bike, but I also do an average of maybe 4 hours/week of something else. That's an average. Winter I do more, summer less. I'm constantly repairing something; I'm very proactive about it.