the last 2 will get ya ;-) only kidding, go for it cpl tips might help ~ take it slow to start, like the 1st hour or so. don't get behind with your hydration, cuz you'd have trouble making it back up. night before: calcium, potassium, magnesium, sodium, then again in the morning & again at the halfway. don't experiment with foods, stick to stuff you know your body likes. after the 1/2 way mark there's no shame in taking breaks to massage legs even if they aren't bothering you. change your position every now and again, meaning get up out of the saddle for some revos. arch your back (to help keep it straight)