I'm 39 years old , weigh in at 185 and about 5'9 .I got back into biking about a month and a half ago. I can knock out 15 miles in the first hour , and then I seem to fall off after that . Last week I droped from 15 miles in the first hour to 13 in the 2nd hour . This week I knocked out 15 again in the first hour and then it was 14 miles in an hour and twelve min. . I just want to make the 2nd hour as good as the first . I do short rides thru the week ( no more than 10 miles ) and then I hit the long rides on Sunday . So what kind of advice can I get for making the 2nd hour stronger ? Thanks , Kicker .