These were my first thoughts as well. As is, the machine is really only good for long-time runners who have their own natural mechanics nailed down, and that's

These were my first thoughts as well. As is, the machine is really only good for long-time runners who have their own natural mechanics nailed down, and that's ignoring the long-term effects of the increased impact, faster than normal muscle movements, etc. Lot more research required, and yes, they'll probably need additional hardware for feet/legs to prevent injuries.