i have a permanent power/speed shortage in all my serves, and i cannot find any solution of solving it ATM. i developed a good selection to add variety so i can hold games with changing serves when i need to (flat, "rafter", slice, kick), and i even manage to keep the consistency of 1st serves. but i just have lame power/speed on all of them. even when i hit a decent flat, it can hardly reach the fence after 1st bounce. i will try to shoot a video soon, but i wonder if there's any "quick fixes" for power? i know it's not just "build more muscle power", because i can see older people and 13yr girls who can get at least x2 more speed than me. thanks.