I'm 60 and have strange, very high numbers. My MHR is 192, RHR 52, LT172 based on the 2x20 test - in fact I can do 3x20 at this pace. Recovery from max about 45bpm in 1 min. Sounds good, I consider myself in good shape. But still I'm slow - not among the slowest at races, but far from the top in my age group. Seems I lack power. Tried weight training, it didn't improve my speed. What do you think?