Great advice here.. I got into cycling on my first go round 20 years ago.. I had been running for over a year and was in decent shape... But my butt hurt when I started cycling..it dawned on me after reading a couple of beginners books on cycling that my butt was going to have to catch up with the rest of me..That means shorter rides on alternate days.One old book said limit your first weeks rides to less than 30 minutes every other day. And then work your way up.Jog on the non bike days..On my second time around I had a sore butt even following the above advice so I bought a Fizik arione..