I am new at road biking and I'm very proud of myself. Bought my bike 3 weeks ago and have put 150 miles on my bike so far. I am 6'0 240lbs so I am trying to lose some weight and change my diet and lifestyle. I need some help from the pros. Do you guys wear underwear under your bike shorts? Also my feet get really numb after about 15 miles any help with that? And what kind of stretches do you do before you ride?