Running vs cycling: what the studies measured for effort, fitness, enjoyment and load

Running and cycling are the two kinds of cardio most of the research uses, so there's more to compare here than for most pairs. Some studies put the same people on a treadmill and a bike on the same day; others trained groups on one or the other for weeks. This page covers what they found, what they didn't test, a calorie estimate for each, and how to choose or mix the two. Setting up an indoor bike is on the stationary bike workout.

Running vs cycling at a glance

In one session: the treadmill asked more, and running felt better

• More energy at the same effort. At the same rated effort, the treadmill used the most energy in all three studies that compared indoor machines (13, 19 and 30 adults), and the bikes sat below it in every one: the two bikes were the lowest of six machines in the first, the cycle ergometer was lowest with one other machine in the second, and the three bikes were among the bottom four of seven in the third.^2,3,4 People chose their own pace in those studies; the abstracts don't say who walked and who ran on the treadmill.
• The same heart rate when people picked the pace. In Hansen 2025, 21 healthy adults did 16 minutes on a treadmill and 16 on an indoor bike at an intensity they chose. Heart rate, as a share of each person's maximum, wasn't significantly different between the two. Enjoyment scored higher on the treadmill, and the 17 who had a preferred mode worked about 4 percentage points harder on that one.⁵
• Intervals: the bike felt harder. In Kriel 2018, 12 sedentary men, average age about 24, did a cycling interval session at their own pace and a running interval session at a set pace. The cycling session drew higher oxygen use, heart rate and rated effort, and the running session was rated more enjoyable.⁶ The two sessions weren't paced the same way, so this is a comparison of those two sessions, not of the two activities in general.

Over weeks: no clear winner for fitness

• The meta-analysis. Menges 2026 pooled 7 randomized trials, each at least four weeks long, that compared running-only training with cycling-only or mixed training in trained or recreationally active people. Between running-only and cycling-only training there were no statistically significant differences for VO2 max measured on a treadmill, VO2 max measured on a bike, or running time trials.⁷ The authors caution that there are few studies, some with a high risk of bias, and the evidence doesn't show the two are interchangeable either.⁷
• The test follows the training. In Marko 2022, 31 elite teenage athletes did a maximal test on a treadmill and on a bike. The runners scored about 7% higher peak oxygen uptake on the treadmill; the cyclists about 8% higher on the bike.¹¹ So a VO2 max number from one machine doesn't transfer one-for-one to the other. How to improve VO2 max has the training trials.

Load under the feet, and lifting beside it

• Running lands; cycling doesn't. In Kaplan 2014, 75 adults without symptoms put about 175% of body weight through the foot jogging on a treadmill and about 201% jogging over the ground.¹ Cycling wasn't in that study; it's done seated with the feet on the pedals, and low-impact training counts it as low impact for that reason. That's a measured force for running, not a prediction about anyone's joints.
• Beside lifting, running cost a little more. In a 2012 meta-analysis of 21 studies, lifting alongside running, but not cycling, significantly reduced both muscle growth and strength gains.¹² The newer reviews and the order to do them in are on cardio and lifting.

Calories: an estimate, not a measurement of you

The Compendium of Physical Activities lists an energy cost, in METs, for more than a thousand activities. One MET is about 1.0 kcal per kilogram of body weight per hour.¹⁰ It lists a stationary bike at 101 to 125 watts at 6.8 METs and 151 to 199 watts at 10.3, and riding outside at 12 to 13.9 mph, moderate effort, at 8.0;⁸ running at 5.0 to 5.2 mph at 8.5 and at 6 to 6.3 mph at 9.3.⁹ For a 70 kg (about 154 lb) person, 30 minutes works out at about 240 kcal on the bike at 101 to 125 watts, about 280 riding outside at 12 to 13.9 mph, and about 325 running at 6 mph. A hard ride above 150 watts comes out higher than that run. The Compendium's own authors say its values are a starting point and don't reflect precise energy use for any one person.¹⁰

What these studies didn't test

The single-session studies were small and mostly in young or middle-aged adults; Marko 2022 tested elite teenage athletes only. The meta-analysis pooled seven trials of trained or recreationally active people, and its authors call the evidence uncertain. None of the studies above measured pain or injury, and this page makes no claim about either.

How to choose, or mix them

As a practical guide, not a finding:

• Short on time or equipment: run, or walk-jog. Running vs walking covers the step down.
• You want no landing, or a long easy session: ride. The stationary bike workout has a steady ride and an interval ride.
• Training for a race: do most of it in the event you're racing. The test follows the training in Marko 2022.¹¹
• Mixing: count both toward the World Health Organization's 150 to 300 moderate minutes a week, or 75 to 150 vigorous.¹³ How to build endurance shows how easy and hard sessions fit together.

If you have pain, an injury or a medical condition, stop and ask a doctor or a physical therapist.

Common questions

Is running or cycling better for cardio?

Over weeks of training, no clear difference: the 2026 meta-analysis of 7 trials found none that was statistically significant for VO2 max or running performance.⁷ In a single session, the treadmill drew more energy than the bikes at the same rated effort.^2,3,4

Does running burn more calories than cycling?

At the same rated effort, the treadmill used more energy than the bikes in all three lab studies that compared machines, though they don't say who walked and who ran on it.^2,3,4 By the Compendium's estimate it depends on the pace and the watts: about 325 kcal for 30 minutes of running at 6 mph against about 240 on a stationary bike at 101 to 125 watts, at 70 kg, and more than that run for a ride above 150 watts.^9,8,10

Running or cycling for weight loss?

Only one trial on this page measured body composition. In Couvert 2024, 16 men with overweight or obesity, average age about 54, did 12 weeks of running or cycling intervals three times a week, matched for energy, with diet controlled. Body weight went down over the 12 weeks, and so did abdominal and visceral fat, measured by a DXA scan. The groups didn't differ in weight, total fat mass or visceral fat; the running group's drop in abdominal fat was larger, at the edge of statistical significance.¹⁴ This page makes no promise about weight or fat for anyone else. How to lose body fat covers what matters most. Cardio vs weights for fat loss has the trials that measured body fat over weeks.

Does cycling help your running?

In the 2026 meta-analysis, cycling-only training didn't produce significantly different running time trials from running-only training, though the authors say the studies are too few and too uncertain to call them interchangeable.⁷

Running or cycling beside lifting?

In the 2012 meta-analysis, running beside lifting reduced muscle growth and strength gains and cycling didn't.¹² Cardio and lifting has the newer reviews, which don't all agree.

If you'd rather have the week planned

Running or cycling is a small decision next to fitting either one around lifting, work and the rest of your life. Coaching is the version where your workouts are built around the days you actually have, and a weekly call looks at the week you just had and rebuilds the next one around what's coming. Coaching for a week that doesn't hold still explains how that works, and apply is the first step. Otherwise: ride 20 easy minutes once this week and run or walk-jog once, and keep the one you looked forward to.