Phone cameras and iDevices with video capability are a great tool for athletes beginning weight training. In the Equipment discussion, I recommend that trainees work in pairs, or with a coach, who is able to record every set for immediate review.
Here’s a simple example of that feedback in action with our oldest daughter Katie, just turned 14. She was about three months into deadlifting, with relatively solid form, but see if you can spot the problem with this set:
It’s one thing to say, “Keep your head and neck aligned, and don’t look up or around”. But showing her the video after that first set was enough for her to spot the problem on her own. Then she tried again:
… with much better results.