I played soccer (actual football...
) for many years...when I was younger. Also tennis, badminton, squash, a little raquetball, and swimming.
Now golf is my go to conditioning sport...JK...it could be, though, if I could afford it.
Actually, I do a fair amout of conditioning work at home - KBells, plyo exercises, complexes, treadmill, rope jumping, calisthenics, etc. My go to conditioning w/o is using a Tabata app on my IPhone. You can set up the number of cycles (for me that's exercises) and tabatas (for me that's rounds). You can also set up your work time (eg: 30 sec) and your rest times (eg: 10-15 sec). You hit start and it will tell you to "work" or "rest". I don't count reps - just go as hard as you can/want. It even lets me play my music in the background.