Nice.
With strobe or Flash, most use shutter control to control the ambient exposure (background and non-subject). If you're limited to your sync speed (1/125, 1/200 or 1/250), you can use aperture to compensate to get there as you've done. If play with HSS (high speed sync), you can keep aperture within your creative control.
Are you using a cable or wireless controller (since you mention plugging in your flash)? It might be worthwhile for the folks following along to mention that you're using off camera flash and what flash power and distance you're using along with the exposure settings.
There's a guy out here that has carved out a pretty good niche with junior athletes essentially doing what you've shown here. He gives the kids a pro athlete photo shoot...
https://www.takoeyephoto.com/?pgid=jsxn52ol-a5908e42-2414-4efd-af67-9212b50e7521
