Dragging a Tire??... Smart or Not?

I saw Jillian Michaels do this on Biggest Loser the other night. Course, this was in the final weeks of the show and Jillian weighs about as much as a pencil, but still....it looked really hard. Jillian was digging in too. I was wondering about the effectiveness of this move. I'd like to try it!

I think to answer the OP question is it a good way to train?  IMO yes.  You are essentially building a better athlete with these type of moves.  This is used more for sports in which your balance and power will be used.  Football for example where you will be hit and need to be able to maintain your feet and run through hits and tackle.  I use this with my guys every off season.  I also like to work them the other way by having them push a sled for a more balanced approach.  With that said will this help you with "speed" in triathlons?  I have my reservations about saying yes to this.  This is because you will almost never be bumped or pulled and you really are looking more for repetition and energy conservation.  SO if your goal is speed come race time I would say there are likely other things you could be doing that would yield better results, but if you are looking for a good workout and becoming a better all around athlete then yes.  Just be sure to use a waist strapping system and not a shoulder harness to avoid too much pressure on your lower back.