I know (or think I do) ideally you'd do most speed work on the track in spikes. Curious to see if some of the older runners do some of your flys or sprints on grass to save your bodies (for instance, if you have 3 high intensity days, do 1 day of accel in grass, 1 day of speed on track, then another day of speed or SE on grass)? If you did, did you see any affect on your times?



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