I would like to do a century ride in about two weeks and have done some moderate base training but not as much as I'd like. I did a 77-mile ride three weeks ago and felt pretty good (average speed 14.5 mph). Did just a few rides in the meantime and rode 70 miles two days ago and did not feel very good (sore butt, wrists, tired quads). My average speed was 14 mph, with around 3,000 feet climbing. I did a hard 65-mile ride five days before, and a 90-minute commute two days prior and a swim the day prior. Now I would like to do a century in less than two weeks, and another century two weeks after that.