How to give my video a better quality?

My coach was recording me fight on his I phone 4 and when I was done he sent it to my iphone 5 and it was in really bad quality is there anyway I can give my video a better quality please help

We don't know what the recording conditions were or how the video was sent from your coach's phone to yours - or if there was a step in between. And we don't know what you mean by "really bad quality"…

Two tips to start:

1) Do not capture video when the device is handheld. Use a tripod, shelf, chair - anything but handheld.

2) Capture video under great lighting.

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