<human>: Can you condense the text into three sentences or less?

My male friend (30/m) and I have started working out together, which is great.  We've been friends for about a year.  He heard I had started to hit the gym and he wanted to tag along. The biggest problem is that he has NO idea what he's doing in the gym. He's doing weird shit with dumbbells that aren't even exercises, and...I'm embarrassed. People are watching him fumble with these weights and it's not a pretty sight. I cringe when people put two and two together and realize we're there as workout buddies. I hate that I'm embarrassed!

I've tried asking gently if he wants coaching, but he blows me off and says he has his routine. Some of that I think is because I'm a woman, and some is because I'm new to lifting myself. But I've done lots of research and reading to come up with something that works for me. I thought about hiring a personal trainer for us, but my gym doesn't have any training like that. 

The last thing I want is to act like a know-it-all or overstep my boundaries with him, but I'm afraid he's going to get hurt. He's already injured his back attempting to weirdly squat with dumbbells. Does anyone have any suggestions as to how I can approach this while keeping his ego relatively intact?
<bot>: workout buddy (30/m) is doing weird workout routine at the gym and I'm scared he's going to hurt himself. How should I handle?