I ran cross country in HS. Was never that great but did it to support my favorite sport which was basketball. Back then I weighed 160 and could run a decent pace for 10 miles. Tried running 3 miles yesterday for the first time in a long time and could barely jog at a very slow pace without my HR spiking above 154 which is my LT threshold according to the 2X20 test on a bike. It was somewhat discouraging to run so damn slow. I guess it is a little harder to move 235 pounds than to move 160.
In terms of exercising for weight loss, does it matter which sport one uses? At this point, I can bike 4 times as long as I can run, so maybe it makes sense for me to stay on the bike. Of course I could start out with a very light 20 minute ride, then go out and run 3 miles, come back and finish on the bike at low intensity.