Indoor cycling is any form of cycling performed on a stationary bike, whether in a group fitness class, a home setup, or a virtual racing platform. It ranges from casual pedaling at moderate effort to structured, high-intensity training that mirrors outdoor road riding. The activity burns energy at roughly 3 to 10 METs depending on intensity, placing it anywhere from moderate exercise to one of the most demanding cardio workouts available.
How a Stationary Bike Creates Resistance
Every indoor cycling bike centers on a weighted flywheel connected to the pedals. As you pedal, the flywheel spins, and the bike’s resistance system determines how hard you have to work. There are two main types.
Friction-based bikes use a leather or felt brake pad that presses down onto the flywheel. Because it’s physical contact, you feel the load immediately regardless of how fast or slow you’re pedaling. These bikes are common in older studio setups and budget home models. The trade-off is that brake pads wear down over time and need replacing.
Magnetic resistance bikes use magnets positioned near the flywheel to create resistance through an electromagnetic force called an eddy current. The load depends on both the flywheel’s speed and the magnets’ position, which means the ride feels smoother and quieter. Magnetic systems also require virtually no maintenance, which is why most modern home bikes and premium studio bikes use them.
Muscles Worked During Each Pedal Stroke
A single revolution of the pedals engages your legs in a continuous cycle of pushing and pulling, with different muscle groups switching on and off at each phase. The power phase, where your foot drives downward, is dominated by your quadriceps extending the knee and your glutes extending the hip. Together, these two muscle groups generate the bulk of your cycling power.
As the pedal passes the bottom of the stroke, your calf muscles activate to stabilize the ankle. During the upstroke (the recovery phase), your hamstrings take over to flex the knee and pull the pedal back up. Your hip flexors also contribute here, especially if you’re clipped into the pedals and actively pulling upward rather than just letting the opposite leg push the pedal around.
This means indoor cycling is primarily a lower-body workout targeting quads, glutes, hamstrings, and calves in a repeating, low-impact pattern. Your core stays engaged throughout to stabilize your torso, particularly when you stand out of the saddle or increase resistance. Upper-body involvement is minimal unless you’re in a class format that adds arm-focused intervals with light weights.
Class-Based vs. Virtual Riding
Indoor cycling has split into two distinct ecosystems, each with a different philosophy.
Instructor-led platforms like Peloton offer thousands of spin-style classes in varying lengths and formats. A coach guides you through intervals, climbs, and sprints, typically set to music. The experience revolves around the instructor’s energy and cueing rather than simulating outdoor terrain. Many platforms bundle cycling with strength, yoga, meditation, and bootcamp classes, making them attractive if you want a single subscription for all-around fitness. Peloton’s coaches develop devoted followings, and live classes include leaderboards so you can compare your output to other riders in real time. The competitive element is present but optional. You can just as easily ride at your own pace and track personal progress.
Virtual riding platforms like Zwift take a different approach. Your smart trainer or bike connects to the app, and the resistance changes automatically based on the virtual terrain. Pedaling uphill on screen means the bike gets harder to pedal. You ride an avatar through digital roads alongside other real riders, join group rides, and enter structured races at every ability level. Ride data looks almost identical to what you’d get from an outdoor ride, complete with power output, heart rate, and elevation profiles. If your goal is to improve outdoor cycling performance or you enjoy competition, this style of training is built specifically for that.
Energy Expenditure and Intensity
The CDC classifies physical activity as moderate intensity at 3 to 5.9 METs and vigorous intensity at 6 METs or above. One MET equals the energy your body uses sitting still. Indoor cycling spans a wide range: a casual, conversational-pace ride sits around 4 to 6 METs, while an aggressive sprint or hill-climb interval can push well above 10. This flexibility is one of the reasons the activity works for beginners and competitive athletes alike. You control the resistance and cadence, so you set the difficulty.
In practical terms, a 150-pound person riding at moderate intensity for 45 minutes burns roughly 400 to 500 calories. At high intensity, that number climbs considerably. These figures vary based on body weight, fitness level, and how honestly you’re pushing the resistance knob.
The Group Effect on Performance
Riding alongside other people, even virtually, produces a measurable boost in effort. A study published in the Journal of Sport and Exercise Psychology tested this by having participants ride stationary bikes either alone, alongside a partner independently, or with a partner whose performance was linked to theirs. Participants who felt their effort affected a partner’s outcome exercised for an average of about 22 minutes per session. Those riding alone averaged just under 11 minutes. Even riding next to someone without any linked outcome pushed the average to nearly 20 minutes.
This phenomenon, called the Köhler motivation gain effect, helps explain why group cycling classes and virtual riding communities consistently produce longer, harder efforts than solo sessions. If you struggle with motivation on a stationary bike, riding with others (in person or through a screen) is one of the most effective fixes.
Setting Up Your Bike Correctly
Poor bike fit is the fastest route to knee pain, hip discomfort, or numbness in your hands. Getting the basics right takes about 60 seconds before each ride.
Seat height is the most important adjustment. When your foot is at the bottom of the pedal stroke, your knee should have a very slight bend of about 5 to 10 degrees. If your hips rock side to side while you pedal, the seat is too high. If your knees feel cramped at the top of the stroke, it’s too low.
For handlebar height, sit upright on the bike, extend your arms straight out in front of you parallel to the ground, then hinge forward slightly from the hips while keeping your spine neutral. The handlebars should land at a height that lets you maintain that flat-back position comfortably. Setting them too low forces your lower back to round. Setting them too high shifts too much weight onto the seat.
Shoes and Pedal Systems
Most indoor cycling bikes come with pedals compatible with SPD cleats, a two-bolt system originally designed for mountain biking shoes. SPD shoes have a recessed cleat, meaning you can walk in them normally without clacking across the floor. They’re the safest default choice because they work on nearly every studio bike.
Some bikes, particularly Peloton’s, use Look Delta cleats instead. These are a three-bolt road cycling system with a larger cleat that protrudes from the sole, offering a wider, more stable connection to the pedal but making walking awkward. A number of studio bikes now feature dual-sided pedals that accept both SPD and Delta cleats, so either shoe type works.
If you’re new to indoor cycling or attending classes at different studios, SPD-compatible mountain bike shoes are the most versatile option. If you only ride one bike at home and it uses Delta pedals, road shoes with Delta cleats give you a slightly more rigid, efficient connection.
Recovery Between Sessions
How often you can ride depends on intensity. Research on repeated high-intensity cycling sprints found that muscle fatigue at the peripheral level (the legs themselves, not the brain) is fully restored after 48 hours of recovery but not after 24. This means back-to-back days of hard sprint work carry a cumulative fatigue cost that one rest day between sessions eliminates.
For moderate-intensity rides, daily sessions are generally sustainable because the muscular demand is lower. A practical weekly structure might include two or three high-intensity sessions with at least one easier or rest day between them, filled in with lower-intensity rides if you want to ride more frequently. Listening to your legs matters more than any formula: if your power output drops noticeably from session to session or your legs feel heavy before you even start, you need more recovery time.