From Pietro Roncalli:
"An additional note. In speaking about John Korir using ramps you mentioned the length is normally 40m, sometimes 20m. But in another message you spoke about Selina Kosgei needing basic strength and using ramps of 60m-80m, seemingly, a long distance to sprint up such a steep grade. I have a young athlete needing to work on speed (very slight build, thin, can run 21 seconds for 150m in his weekly session of speed but never has been able to run faster for basic speed, like 18-19 seconds that is needed to be among the best high schoolers at the 800m-1600m). He uses the short sprints uphill you have recommended with good frequency, needing a little work, but I am deciding whether or not to use ramps with him also to see if he can take more time off his 150m sprint (and by extension, his 400m, 800m, 1500m, etc. getting faster so long distance speeds are easier if he can run 1-2 seconds faster over 150m). It could be he needs to grow, but already he can run 21 and he used to run 25 for the last, which is run fastest. I use this session normally once per week in summer and winter when not competing for track and cross-country. It is progressive with several sets of 150m strides (2-3 sets, 6 repetitions) getting faster. Your advice is appreciated.