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You will now be taken to the USPTA web site to complete your purchase. If you do not have a "My USPTA" account, you will be asked to create one. This is the same account you will use to login here at TennisResources.com. After you have completed your purchase, come back to the TennisResources.com web site and log in.
You will now be taken to the USPTA web site to complete your purchase. If you do not have a "My USPTA" account, you will be asked to create one. This is the same account you will use to login here at TennisResources.com.
After you have completed your purchase, come back to the TennisResources.com web site and log in to view the videos. If you are purchasing a Pay-Per-Video, the video will appear in your My Account page here on TennisResources.com within 5 minutes after your purchase.
Congratulations! You have completed the video, and educational credits have been submitted to USPTA.
Jack Groppel, Ph.D., answers the question, “At the recent USPTA World Conference, I heard you speak on the biomechanics of tennis. During the presentation, you showed a video and briefly mentioned the crossover step in serving versus when the front foot comes in first. Could you explain what happens mechanically in these two movements?”
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