Background: Sports often require perfect skills in situations of high physical stress, if having good physical condition makes it easy for athletes to master and improve technique.

Purpose: This research aims to determine the effect of circuit body weight training on the muscle strength of basketball players.

Methods: This research used Pre-Experimental Design. Research and the design used the One Group Pretest-Posttest Design. Research population of basketball extracurricular players at SMA Negeri 1 Sanden, while the sampling technique used was purposive sampling with a total of 12 players. The instrument used was a leg and back dynamometer to measure the strength of the leg and back muscles and a hand dynamometer to measure hand muscles. Data analysis technique used hypothesis testing with t test (paired sample t test).

Results: The results showed that the percentage increase in leg muscle strength was 41.1 %, the percentage increase in back muscle strength was 58.3 %, and the percentage increase in hand muscles was 8.95 %.

Conclusion: So, it can be concluded that there is a significant effect of circuit body weight training on the muscle strength of basketball players.

Keywords : Circuit Body Weight Training, Strength, Basketball