I haven't even had one forkful of Christmas dinner and I'm already on about training! Just flicked through the cross-trainer thread on here as I've just got one (worth the money btw) and wanted to get some views on treadmills as I was going to purchase one in the new year. A mate of mine says they're nothing in comparison to a jog - well she does a few laps round Finsbury Park in North London but that's not neccessarily what I trying to replace with a treadmill. Anyway, digressing a little, what are the major differences between the two (apart from one being outside and one being inside)? Most of the motroised ones have levels of inclines and so on to simulate uphill running etc, would I be missing out on something very vital apart from the wind blowing through my hair?