Koko FitClubs of Brookline and West Roxbury are taking part in a national challenge to raise $20,000 for the American Cancer Society (ACS). The state-of-the-art workout centers invite members, employees and neighbors to participate in a “Koko 5 Million Point Challenge,” from 8 a.m., May 4 to 8 a.m., May 5.

During these 24 hours, members can perform 15-minute cardio sessions at their local club, earning 500 Koko points at each session. Any non-member who volunteers 15 minutes will be rewarded with a free, 15-day membership. Points will be tallied at 120 Koko FitClubs across the United States and, if the goal is reached, Koko will donate $20,000 to the ACS in celebration of its 100th birthday.

“Everyone can make a real difference in the fight against cancer by dedicating just 15 minutes of their time to a great cardio workout,” said local Koko FitClub owner Lana Lemeshov. “We hope it will also inspire 10,000 workouts across the country and encourage people to take charge of their own health and become more active with Koko’s personalized exercise and nutrition system.”

Cost: Free. Location: Koko FitClub, 39 Harvard St., Brookline Village and 77 Spring St. (Shaw’s Plaza) in West Roxbury. For more information, visit KokoFitClub.com or call 617-566-5656 (Brookline) or 617-325-4800 (West Roxbury).