Avocados Number wrote: Although I think that Henry knows his body better than any of the rest of us, my own suggestion would probably be for him to stay away from the track until he drops some more weight and has less pain in his hamstrings. If he wants to run hard, it should probably just be on the hills right now.
Sure, hills sound like the safer bet.
But for anyone suggesting he should just do easy aerobic exercise until the weight comes off, see some of the mounting evidence of links between intensity -> metabolism -> weight loss e.g.
http://www.latimes.com/features/health/la-he-interval15jan15,1,2160770,full.columnOf course high intensity running provokes injury especially when you're carrying extra mass; maybe the optimal thing for weight loss is something low- or no-impact like cycling or even water running, where you can safely go hard a whole lot longer and more often.