At Harmony Cycling of Whitestone, the road to fitness is paved with a variety of physical challenges, from spinning and yoga to boot camp and Zumba. During 45-minute spinning classes that take place in a brick-walled room lined with a floor-to-ceiling mirror, instructors guide small classes through techniques that raise heart rates and test the mettle of both beginning and veteran spinners. The studio holds both early-morning and late-evening classes so that daytime-soap-opera gaffers can squeeze in time to burn calories and start losing weight. Classes that fall under the facility’s Harmony Yoga banner offer a balance to fast-paced spinning with stretching and breathing practices for many ages and walks of life that include teen yoga, prenatal yoga, Hatha, and gentler chair yoga. Aiming to give fit seekers more options for their fitness, boot-camp sessions help shred calories, and Zumba classes impart an inner burn that reminds fat of its impending short lifespan.