Lately, I've been really trying to hit consistent kickers, starting from the toss. I realized how straining it is to get into that position to hit the kicker. I'm bending my knees a bit more to keep my body in that weird pose. I feel like I'm going to fall backward on myself if my legs have their last give. I'm trying to bend my knees to get that angle, but I still feel some strain on my back/spine. I have to do all this and hold it long enough for the ball to drop beneath the zenith of my swing to brush up the ball, and hope it loops into the box and kick up. The ATP guys make it look so easy and effortless. I'm not sure if it's just me, but I feel like I have to exert a great deal of effort to do this serve. Or am I doing it wrong? Sometimes, I can't even tell if I start slacking, like placing the toss a bit forward and hitting a flat/slice instead, so I need a watcher to check that I'm truly tossing behind my head and getting into that "backwards arch" position. I'm serious, I don't think I can bend my knees to a near 90 degree angle to get myself in that power position. Am I simply weak (I doubt it, I run like 6+ miles a day), or do you truly need your back to compensate a little for your knees?