This article discusses the background, statistics, mechanisms, timing, dosing, influences, and practical applications for the use of caffeine as an ergogenic aid.
In this video from the NSCA's 2014 National Conference, Bret Contreras discusses how moving horizontally - quick breaks and agility drills vs. hopping - can result in explosive acceleration and speed.
There is a sound theoretical rationale supporting a potential role for muscle damages in the hypertrophic response, but a cause-effect relationship directly linking these gains to muscle damage is yet to be established. If such a relationship does in fact exist, it is not clear as to what extent of damage is optimal for inducing maximum muscle growth.