Thanks for all the input, I was thinking along the lines of deadlifts of 1/2 bodyweight and increasing incrementally. Also starting with 12" plyo box, then moving up to 18"
after a month and maybe 24" after a couple months. She would do these exercises
2 times a week.
Also she has rather skinny upper and lower legs. I think she has speed but not much power.
I notice a lot of the better sprinters have much larger upper legs.
My son is 14 years old, can he do the same exercises? He is 5'11"/135 lbs, ran the 100m in 12.0 as an 8th grader. He also plays basketball and can grab the rim easily. He wants to dunk and hopes
to get his time to 11.5 in the 100m as a freshman. His legs are skinny also.