Safety

"Safety also get dragged into discussions of movement velocity, under the assumption that fast is dangerous, as in driving a car. But just as in driving, it really depends on the ability of the operator. The more experienced an athlete becomes with barbell exercises, the more efficiently and safely he can perform them at higher speeds. Squats can be dangerous for novices at high speeds, but for advanced athletes high-speed squats are a very productive power exercise." Mark Rippetoe, Practical Programming