The Ring/TRX/Strap Row (whatever toy call it) may be my favorite upper body pulling movement but one that may technique flaws are often seen.
❌ Sag the hips.
❌ Over extend at the low back.
❌ Poke the head through.
✅ Move the scapula through a full range of motion.
✅ Keep the body a straight line.
✅ Keep the head in-line with the body.
Hope that helps ‼️