Like a lot of people working in tech, I've had persistent neck and posture issues for years. I'd love to see you expand to cover those, focusing on the many smaller muscles in the neck like SCM/Scalenes/Occipitals/etc.
Another great area to expand is 'click where you have pain' and it would recommend certain stretches, weights, trigger points, etc. There are common pain referral patterns that most people do not know about and I imagine that would be very helpful for people who don't have easy access to physical therapy or even feel they are candidates for it.
After casually mentioning my neck issues to people over the years, I've found so many people open up about persistent pain they have but that they're not addressing because it hasn't reached a bad enough point. I think that's an ideal audience to target with online resources like musclewiki.