I'm a junior in high school. This is my 3rd year running xc, and I ran both indoor/outdoor track freshman and sophomore years. Before this summer, I hadn't really ran at all in the summer. This summer I took it hard. I took a day off, 2 long runs a week, 1 tempo a week, 1 interval/repeat workout a week, and 2 easy days a week. When the season started, I started taking an easy day everyday except for Tuesday and Wednesday. Tuesday is an interval/repeat day, and Wednesday is a tempo. I was running 17/sub17 for 3 miles in September, however, as the season progressed my times got increasingly slower, to the point where I couldn't manage faster than a 17:30/17:45 (this was my PR last year). Tapering has not helped. Taper weeks now have 6 easy days, and 1 interval/repeat day (Tuesday). I don't know if I peaked too early in the year/I'm burned out. Sometimes, after I run my warmup and before my run/workout, my thighs feel very heavy and tight, and I'll stretch it out, but it usually comes back during my run/workout/race. I have not changed my sleeping/eating habits from the beginning of the season. At this point, I'd just like to get back to my 17/sub17 shape I was in earlier. Any advice/help on this?