I just started actually. Decided I'm going to train as much as possible with bare feet. First week and my feet ache, in an oddly pleasant way. But I'm worried that perhaps my feet aren't strong enough yet. Few days on concrete, and damn, I feel good, and I can land safely most of the time, but I see a lot of flaws in my technique. Also, I'm afraid I'm gonna smash my toes on the rails! (Still I do it, and it's fun)
Any tips for a budding spartan to strengthen his feet when (or possibly when he's not) doing parkour?