Ground-based free weight lifts, especially the explosive Olympic-style lifts, are highly recommended for athletic conditioning for the core muscles. They can provide a moderately unstable stimulus to augment activation of the core and limb muscles, while still providing maximal or near maximal strength, velocity, and power output.
From the 2021 NSCA’s Coaches Conference, Adam Feit, Coordinator of Physical and Mental Performance at Springfield College, discusses the benefits of satisfying athletes’ and coaches’ basic psychological needs. He also explains how behaviors can help or hinder performance and how to create an autonomy-supportive training and coaching environment.
This article presents information about assessing speed and agility in a controlled environment with a test that is similar to the actual demands of a specific sport.
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.