I weigh 275 and I feel really tired when going uphills. I could barely make it uphills when walking so I dont imagine its any different with a bicycle. Going downhills on pavement I can ride 40mph and up.I ride on dirt roads it takes more effort to go the same speed you would on pavement. Hopefully I get to get better at cycling each day.
How did it feel when you first started cycling at an adult age?