To upload a video, just upload the clip to YouTube (as unlisted if you don't want other people to watch it) and then you can just post the link here and embed the video into your @forum post!
Your shoulder press looks good! Dumbbells will be slightly in front because you should have your elbows slightly tucked forward which you do, so that's good! And your lower back and shoulders blades should be touching the bench, with a slight arch, so you're on point with that as well!
Awesome job!
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