>>717346621
Legacy sparks and uncapped SRs
It'll be easier with shorter distance runners first
More so for those that have innate training boosts on speed/power
Reaching legendary status will often improve your rating as well, but won't affect your stats
Curren, Daiwa, Grass, Vodka, El Paso, Maru would be good ones to start with
Stamina sparks make it the easiest as you can focus more training on speed in instead, especially on shorter distances