With San Francisco officially moving into the orange tier, gyms and boutique fitness studios can reopen for indoor workouts at 25 percent capacity.

Studios teaching everything from heated yoga to weight-lifting are more than ready, so if you're long over Zoom workouts and tired of freezing during outdoor "sweat" sessions, wear your most breathable mask for a small, socially distanced class inside one of these local studios.

MNTStudio

MNTStudio's SF location is open for 50-minute multi-level reformer Pilates classes set to upbeat music for a maximum of three clients at a time. You can also book private sessions at the SF and Palo Alto locations, or keep on moving at home with Zoom classes ranging from barre to Pilates Bootcamp. Expect temperature checks and extra sanitation. // 766 Brannan St. (SoMa) and 575 High St. Ste. 120 (Palo Alto); packages and memberships available, mntstudio.co.

Orange Theory

Orange Theory's mid-Market studio is offering two new types of sessions: Lift 45 and OT Open. Resistance training, heavy lifting, and floor work help with lean mass formation and form improvement in Lift 45 full, upper, and lower body sessions; in OT Open, you're free to do your own thing (with coach supervision) on a treadmill or rower. As usual, a heart rate monitor will provide you with fitness data insights. // 1411 Market St. (SoMa); packages and memberships available, including a free first class, orangetheory.com.

Karma Yoga

Work up a sweat inside Karma Yoga's heated Marina studio. Pilates, yoga, and high-intensity interval training unite in Hot HIIT Flow, a 45- or 60-minute class with a room temp of 95 degrees. Alternatively, in power yoga, you'll move through dynamic sequences while detoxifying your muscles. Can't decide which class to take? Karmic Flow is the perfect combination. If you'd rather work out at home, Karma Yoga's instructors are still offering plenty of live stream options. // 1906 Union St. (Pacific Heights); various packages available, including a New Student Special (10 classes for $65), karmayogasf.com.

Project 13 Gyms

Project 13 Gyms offers indoor group training sessions for up to five people, plus open gym time for members. After a temperature check, every hour-long class commences with a hip flow sequence, followed by a strength or conditioning session, and finally with a mobility cool down. An app will provide you with your full, lower, or upper body specific plan, and sanitized equipment and trainer feedback will ensure you make the most of your workout. // 1440 Bush St. (TenderNob); various packages and memberships available including a 2 For 1 Intro Offer (two classes for $40), project13gyms.com.

Yoga Flow

With three SF studios plus a Walnut Creek location on the way, yogis around the Bay will love Yoga Flow's multi-level Vinyasa flow classes. The heated space guarantees you'll leave nice and sweaty and breathwork will help you focus on the present while increasing strength and flexibility. // Locations in Noe Valley, Pacific Heights, and Ingleside; packages and memberships available, including $25 for seven days of yoga for new students, yogaflowsf.com.

Bodyrok

Bodyrok's custom reformers are ready for use at the brand's Marina, Mission, Polk, and Haight locations. Morning and evening semi-private Sculpt Full Body sessions offer the same ab-shaking, booty-burning 45-minute workouts as usual—just with fewer clients and a grip sock and face mask requirement. // Various locations in SF, Oakland, Berkeley, and Petaluma; $30 for semi-private classes, bodyrok.com.