Gyms, health clubs and workout studios began reopening in late spring following government-ordered shutdowns aimed at halting the coronavirus spread. But most are only allowed to have a fraction of their regular clientele onsite at one time. And some clients are staying away for fear of catching the virus. The International Health Racquet & Sportsclub Association, an industry group, estimates that gyms, health and fitness clubs lost an aggregate $13.9 billion during shutdowns as of Aug. 31. The group warns that without government help, at least a quarter could close by Dec. 31 as limits on indoor workouts continue.