Hello, so here's the thing. I want to ride faster. Right now, I can maintain about 16 mph for around a 20-25 mile ride. I can't seem to get over that hump. I've been stuck on the 16 avg. since March. I'd like to be able to ride 18-20 EVENTUALLY. I live in a pretty hilly area so there is no such thing as a 'flat ride' round these parts; however, there are several women in the area who consistently ride at about 20 mph. so I know it's possible. I'm just stuck. Dunno if I should ride longer, hill repeats, tempo rides?