Paintball is more of an anaerobic sport than an endurance sport. Moreover, the biggest risk is joint injury.
Sprints, plyometrics, core exercises are more beneficial.
Long distance running doesn’t hurt, necessarily, but doesn’t develop the correct muscles that help in the sport.
In the gym, lifting for size (“getting swole&rdquo

also doesn’t help in this sport. Lifting for high repetitions with lower weight develops more speed and injury resistance. And it is important to do exercises for smaller muscle groups, especially the rotator cuff (shoulders).
Any kind of drills you can do during the week day will help. The biggest challenge in progressing in this sport is the inability to practice more frequently. Three 1-hour practices during a week is more beneficial than one 3-hour practice on a weekend.