I went out to hit against the wall for a bit, as everybody was busy today (probably doesn't help that it was overcast and started to drizzle during my session!) and took a few videos so I could watch myself, as I've never actually done so before. I'm looking for any feedback (or criticisms) on my serve and groundstroke form. Also, though it might be hard to judge from the video and the lack of a hitting partner, what would you rate me on the NTRP scale approximately? I've always considered myself 4.0 or maybe 4.5, but I was never quite sure (especially as Youtube videos of NTRP players varies a lot). Thanks for reading!
Groundstrokes 1 (shorter video): http://www.youtube.com/watch?v=gjegv9QperM
Groundstrokes 2 (longer video): http://www.youtube.com/watch?v=3iHlMmj_4Eo