Shooting for a takedown requires an explosive burst of energy; it’s taxing on your endurance. If you go for it and your opponent stuffs it, then you just expended a lot of energy without getting a reward.
Obviously, you need to have decent conditioning for BJJ. With that in mind, though, exercises like steady-pace jogging may not be the ideal type of workout. Instead, consider cardio in short bursts. That means going at full speed for a short duration followed by brief intervals of slowing down. This is much more effective because it simulates what your body goes through in a BJJ match, especially when shooting and defending takedowns.