In this video clip, Jeff Salzenstein, founder of Tennis Evolution, will discuss the second serve problem which is the Trophy Position Squat (TPS). If... | By tennisfiles.com | Facebook
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If You Can't Extend From Your Thoracic Spine, You're Squandering Power and Inviting Injury | Article | Racquetfit
![Jeff Salzenstein follows through on a serve to Alex Bogomolov Jr. during the first set of their first-round match at the Tennis Channel Open, Monday, Feb. 21, 2005, in Scottsdale, Ariz. Salzanstein Jeff Salzenstein follows through on a serve to Alex Bogomolov Jr. during the first set of their first-round match at the Tennis Channel Open, Monday, Feb. 21, 2005, in Scottsdale, Ariz. Salzanstein](https://c8.alamy.com/comp/2NGCFAW/jeff-salzenstein-follows-through-on-a-serve-to-alex-bogomolov-jr-during-the-first-set-of-their-first-round-match-at-the-tennis-channel-open-monday-feb-21-2005-in-scottsdale-ariz-salzanstein-won-6-3-7-6-4-ap-photoroy-dabner-2NGCFAW.jpg)