Here is my advice:
- Take a few days off. Not just one but two or three in a row. This is by far the best way to recharge but sometimes it is the hardest one to choose. Missing a workout can drive a person crazy when their normal schedule is to do something every day.
- Do some sort of activity that is not even remotely related to triathlon. I have started attending group fitness classes once a week just for a change of pace. My gym also has a rock wall that I like to climb every so often (great cardio workout, that heart rate will sky rocket when your scared of falling).
- Force yourself to do the workout. This one can be dangerous!! pushing your body to workout when your mind is not in it can lead to injury and can also lead to further burnout. That said sometimes breaking through that mental barrier can strengthen you mentally and physically.
Just some thoughts since this was the second day in a row that I consciously slept in (Oh! Crap did that really happen!! I better get to the gym tonight before I lose all that conditioning I've gained).