Yes, jogging is a high-impact exercise. The defining feature of high-impact activity is that both feet leave the ground during the movement, meaning your body absorbs a significant jolt with every landing. During jogging, your joints handle vertical forces between 2.0 and 2.9 times your body weight with each stride, compared to just 1.0 to 1.5 times body weight during walking.
What Makes an Exercise “High Impact”
Impact level refers to how much force your skeleton absorbs when your foot hits the ground. Low-impact exercises like walking, swimming, and cycling keep at least one foot on the ground at all times or eliminate ground contact entirely. High-impact exercises, including jogging, running, jumping rope, and plyometrics, involve an airborne phase where your full body weight crashes back down with each step or jump.
The key measurement is ground reaction force, expressed as a multiple of your body weight. Walking generates forces that top out around 1.5 times body weight. Jogging starts around 2.0 times body weight at slower paces and climbs to roughly 2.9 times body weight as speed increases. That’s a meaningful jump. For a 170-pound person, each jogging stride sends somewhere between 340 and 490 pounds of force through the ankles, knees, and hips.
How Impact Affects Your Bones
High impact isn’t inherently bad. In fact, your bones need it. Bones respond to mechanical stress by becoming denser and stronger, a process driven by the strain that ground reaction forces place on your skeleton. Cross-sectional studies consistently show that athletes who do high-impact exercise have greater bone mineral density than those who stick to low-impact activities or don’t exercise at all. Longitudinal studies confirm that high-impact exercises actively increase bone mineral density over time, rather than just slowing age-related loss.
The mechanism works like this: when forces travel through bone, they create tiny fluid shifts in the bone’s internal structure. These fluid dynamics trigger sensors in the bone tissue to signal for new bone growth. Interestingly, research on loading intervals found that spacing out impacts (about 30 seconds between high-force landings) produced greater bone-building effects than rapid, repetitive impacts with only a few seconds between them. The bone’s sensitivity to each individual impact appears to reset during brief rest periods. This doesn’t mean you need to stop every 30 seconds while jogging, but it does help explain why varied-pace running and interval training can be particularly good for skeletal health.
How Impact Affects Your Cartilage
Cartilage tells a more nuanced story. Research comparing long-term runners to non-runners found that sustained running actually increases the thickness and volume of knee cartilage in certain regions, suggesting the tissue adapts and becomes more resilient over time. The changes from any single run are reversible, but years of consistent running appear to enhance the knee’s functional capacity.
There’s a tipping point, though. The relationship between running intensity and joint health likely follows an inverted U-shaped curve: moderate jogging strengthens cartilage, but very high-intensity running can overload the joint and lead to pathological changes. High-intensity physical activity has been identified as an important risk factor for knee osteoarthritis in older adults. The key distinction is between moderate, regular jogging and chronic high-mileage or high-speed running over many years.
Foot Strike Patterns Change the Load
Not all jogging impacts are equal. How your foot meets the ground dramatically changes the force your body absorbs. Most recreational joggers land heel-first, which produces a sharp spike called an impact transient, a rapid burst of force that shoots up through the leg. Switching to a forefoot strike pattern (landing on the ball of the foot) eliminates this spike entirely.
The numbers are striking. Runners who retrained to a forefoot strike reduced their vertical loading rate by roughly 42 to 50%, and those reductions held steady over long-term follow-ups. By comparison, simply increasing cadence (taking shorter, faster steps) only reduced loading rates by about 14 to 16%. Forefoot retraining was three times more effective at lowering impact forces than cadence changes alone. This makes foot strike the single most powerful technique adjustment for managing impact while jogging.
Running Surface Matters Less Than You Think
Many joggers assume that switching from concrete to grass or a rubber track will significantly reduce impact. The actual difference is surprisingly small. Research measuring accelerations across surfaces found that concrete produced only about 3 to 5.6% higher peak impact forces than synthetic track or grass. That’s a real difference, but it’s modest compared to the 40 to 50% reductions achievable through foot strike changes.
Softer surfaces do offer other advantages. Grass and trails create slight instability that engages more stabilizing muscles, and uneven terrain naturally varies your stride, distributing forces across different parts of the joint with each step. But if your primary goal is reducing impact, technique changes will get you much further than a new running route.
Cushioned Shoes Can Backfire
Here’s a counterintuitive finding: maximally cushioned running shoes can actually increase impact forces rather than reduce them. A study published in Scientific Reports found that runners in highly cushioned shoes experienced 10.7% higher ground reaction force peaks and 12.3% greater loading rates at faster speeds compared to conventional shoes. Even at a slower pace (about 10 km/h), the maximally cushioned shoes still produced 6.4% higher impact peaks.
The likely explanation is that your legs automatically adjust stiffness based on what you’re standing on. When you sense a soft, cushioned surface underfoot, your body increases leg stiffness to maintain stability, which ends up amplifying the very forces the shoe was designed to absorb. This doesn’t mean all cushioning is bad, but it does mean that buying the thickest-soled shoe on the shelf isn’t a reliable strategy for reducing impact.
When High Impact May Not Be Appropriate
Jogging’s cardiovascular and mental health benefits are well documented, even for people who are overweight or obese. Running can improve metabolic efficiency, reduce circulating inflammatory molecules, and lower cardiovascular disease risk. But the musculoskeletal math changes at higher body weights. People with a BMI above 30 face a greater risk of degenerative joint disease, and the 2.0 to 2.9 times body weight multiplier means the absolute forces on their joints are substantially higher.
No formal clinical guidelines currently exist for safely initiating a jogging program at higher body weights. The general approach recommended by sports medicine specialists is to start with non-impact exercise or walking on flat ground, progress to incline walking at higher intensities, and transition to jogging gradually. People with existing joint pain in weight-bearing joints (low back, hips, knees, or ankles) benefit from building a base of low-impact cardiovascular fitness before adding the repeated loading that jogging demands.