Best natural remedy to loose my gut.?

Well i don’t drink all the time so its probably a combination of a beer gut and just sitting around the house the entire winter. I don’t have a car but I do have a nice Trek 5300 that I use anytime I leave my place. I have been swimming nearly everyday since it warmed up and plan on continuing. I eat alot of BLT’s from Jimmy Johns. I try to drink natural organic tea instead of soda pop. I dont eat much candy at all. Im trying to get healthy and tone my entire body up. Is there anyway to get rid of my gut without doing situps. I prefer to be moving around like jogging or walking.