I'm 200 lbs and hills can be tough. There is a nice Downhill leading to a steep uphill that I try to go back and forth several times. Downhills are fun and give a nice break before mashing it uphill again. I find the toughest part is still getting the correct gearing. Sometimes I can shift smooth, other times its like my bike just doesn't want to shift when there is so much tension on the drive-train.... I climbed my steepest hill yet yesterday. Short and steep. I would say like 20% grade. I had to zig-zag back and forth to make it up. A full body workout for sure.