@giddion – I do a lot of resistance exercise, and I can tell you that it is good for the connective tissue, as well as for building muscles. As my muscles grow, the dense irregular connective tissue becomes stronger.
I have read that this adds extra protection to the muscles. Also, if I ever find myself in need of physical therapy, it could help me recover more quickly.
When I first started doing resistance training, I had no idea that my connective tissue would benefit. This is just something I learned when I became more interested in the science behind it.