This model suggests that concentric muscle actions are
preceded by eccentric muscle actions. And for optimal performance, the amount
of time to switch from the eccentric-to-concentric contraction is one of the
most decisive components to athletic success.

There are many factors that contribute to efficient and
effective human movement. For example: core stability, core strength, muscular
endurance, power, balance, posture, flexibility, coordination, training
experience, coaching, etc. In your experience, which single factor is the most
important contributor to enhance performance? Why?