Megan Robinson, 17, of Mountain View, training for volleyball, uses the force plate at Sparta Science in Menlo Park, Calif., on Monday, May 5, 2014. (John
Megan Robinson, 17, of Mountain View, training for volleyball, uses the force plate at Sparta Science in Menlo Park, Calif., on Monday, May 5, 2014. (John Green/ Bay Area News Group) ( JOHN GREEN )