10/20 yd sprint times for softball

I never talk in meters always yards, the bases are measured in feet.

It does not matter what you want to do - you have to do what you need to do.

Special strength (MxS - Max strength) and explosive development (high intensity plyos/ explosive jumps) cannot be developed until general strength (Anitomical adaptation / accumulation weights(hypertrophy) are in place.

So in the begining the 30 yrd sprint would be a better indicator of improvement in speed. As your athletes develop the special strength (explosive power) than the 20 and 10 yard sprints could be tested.