Will Hamilton: Sixth part of the serve is the leg push. From the trophy pose, again to review, the weight is equal on each foot, and your knees are fully bent. Push off and up into the court. What you are looking for is to have fully pushed off, and have your legs totally straight. At the same time, your racquet has dropped straight down behind your back. If we combine the upper and lower body, you want to make sure; you've time it so the two parts work together.

From the trophy pose, I push off and up into the court with my legs. Now, if we go back to the trophy pose, I time it so that I've got my racquet dropped. The racquet's pointed straight down behind my back. At the same time, I've fully pushed off my legs.

This is Tim Henman in his trophy pose. And again, he uses the party stance. The weight is equal on each foot, and he's got his knees fully bent. And now, let's take a look at him at racquet drop. The racquet's now pointed straight down, and he's fully pushed off with his legs. Only his front toe is still on the court, and his legs are completely straight.

If we go back to him at the trophy pose, he times it so that he is fully pushed off his legs by the time his racquet is pointed straight down.