Maybe from a lot of running + zhan zhuang + a balanced diet? I dunno. They feel fine at any rate.
For sure. I think this is more key than whacking your shins with a rolling pin. lol
No point doing that if your not eating the right stuff or putting load pressures on the bone regularly.
Also i have noticed that, from alot of running and certain training methods the tibialis anterior is getting very developed and starting to cover the 'blade' of the shin bone effectively.
cheers
Chris