I have identified your hitting trainer as the best for proper upper-body swing mechanics. - Howard Nakagama, Scout, Chicago White Sox ; USA.
LASER PST
"One of the Pony League teams, even though, not an elite junior team, are beating the elite middle school, baseball teams; they are using the Laser Power ST." - South Korea
LASER PST
"When I do this, straight back, I feel the muscle contraction... you're doing the right thing." - Federico Giordani, Team Europe, L.A Dodgers Prospect.