The Magic of Single-Foot Forehand Training 

This is a *difficult* drill. That's the point of it. As such, unless you're already a strong athlete, start slow: only 5 reps the first time you do it, 10 if you feel fine, and that's it. It requires strength throughout the entire leg - foot, ankle, calf, knee, hamstring, quad, hip - and many players will find weaknesses along that chain exposed when they do this drill. There is also a technical element required - you need to be able to land effectively. This article addresses the skill of landing with regards to tennis: faulttoleranttennis.com/the-split-step-why-when-and-how/ I should have addressed the physically demanding aspect of this drill directly in the video. I've seen comments from a few players who have jumped in a little too fast and hurt themselves. I'm very, very sorry! I still very strongly believe in this drill, so I'm pinning this comment in an effort to avoid that in the future.

On the one hand, doing drills like this exposes those with muscular weaknesses/poor movement patterns to injury. On the other hand, not being able to hit one-legged groundstrokes is procluding to playing at a 4.5 level or beyond. I've done this drill with a coach in the past and found the reasoning behind it to be sound. Specifically getting the back foot in line with the ball - if you can't get there you know right away.

In your defense the balls coming to you were way lower compared to hers, so you needed to bring the ball up with an upwards swing and you had less time to adjust for them too.

😲

This is how Nick Kyrgios plays most of the time. Single leg slap city 👌

This is a superb drill. BTW, I loved your book on the forehand (and how you described the modern forehand as a "biomechanical masterpiece," I think you called it?) Any chance you might do a similar book on the one-handed backhand?