Last couple of tempo runs I have been about 15 sec per mile slower due to the snow, ice , sleet and crap outside (at least I am saying that is the reason, or else I just suck)
but the effort into it felt about right...so is this still beneficial?
I am training for Boston and don't want to run more than a few miles on the TM as it doesnt agree with me..I cant seem to maintain the same speed on a TM as I do outside.