Planet Fitness (PLNT) 10-Q2023 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report of Planet Fitness, Inc. (the “Company”) on Form 10-Q for the fiscal quarter ended September 30, 2023 filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Craig Benson, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

Date: November 9, 2023