Play flag football. It's a great sport without the terrible risks. It's also being played by girls too.

I coach middle school girls. It's a blast. It has by far the most strategy of any youth sport.

If I had sons, I wouldn't let them play tackle football before high school, and I would have to think long and hard about that even.

I enjoyed flag football as a coach so much that I built my own play creation and team management software (https://getplaylook.com). One of the things that you get with flag at an early age because you aren't so focused on the physical side of the game is a higher emphasis on technique, particularly route running, and play design. Good play design can scheme people open, even if your team isn't very fast.