According to IAAF records, Jim Ray Hines was the first person to break 10 seconds for the 100-metre dash in 1968. To put that time into context, fewer than 180 sprinters have ever run faster than 10 seconds for the 100 metres. “Lightning” Louis Rhys Zammit who has recently signed for the Kansas City Chiefs, has a PB of 10.44 seconds.
Why am I telling you all this? Because, with the advent of faster tracks, better equipment, and a huuuge focus on performance enhancement not much has changed. Jim Ray Hines would have made the final of the Tokyo 2020 Men’s final.
Before you focus on improving a skill it’s worth asking how much change you can expect to create. True, you can dramatically improve the speed of a slow person or child, but instead of what? Enjoyment, agency, or social skills.