Low impact exercise is any physical activity where at least one foot stays in contact with the ground (or where your body is supported by water, a seat, or a machine) so your joints absorb less force with each movement. Walking, swimming, cycling, yoga, and elliptical training all qualify. The defining feature isn’t intensity or effort. It’s how much shock travels through your joints.
How Low Impact Differs From Low Intensity
People often confuse “low impact” with “easy,” but these are separate ideas. Impact refers to the forces your body absorbs when it hits the ground. Intensity refers to how hard your cardiovascular system and muscles are working. Swimming laps at a fast pace burns energy at nearly 10 times your resting metabolic rate, which is more demanding than jogging, yet it puts almost no impact on your joints because the water supports your weight. Stationary cycling at a vigorous effort level reaches about 11 times resting metabolism, comparable to racing a bike outdoors, while your knees and hips experience zero landing forces.
Yoga sits at the other end of the spectrum. Hatha yoga registers around 2.5 times resting metabolism, making it both low impact and low intensity. Power yoga pushes that to about 4 times resting metabolism, still gentle on joints but enough to raise your heart rate meaningfully. The point is that low impact gives you the full range from gentle recovery sessions to grueling workouts. The ceiling on effort is much higher than most people assume.
What Happens Inside Your Joints
When you walk, the peak vertical force through your legs is roughly 1.0 to 1.5 times your body weight with each step. When you run, that force jumps to 2.0 to 2.9 times your body weight. That difference matters over thousands of repetitions. A 30-minute run involves around 5,000 foot strikes, each one sending two to three times your weight through your ankles, knees, and hips.
Low impact activities reduce or eliminate that repeated loading. On anti-gravity treadmills (used in physical therapy), researchers have confirmed that as body weight support increases, ground reaction forces, joint forces, and peak shin bone acceleration all drop in a predictable, linear way. Each percentage of body weight you offload reduces peak force by about 0.44%. Water-based exercise achieves something similar by using buoyancy to support your body, which is why aquatic therapy is a standard recommendation for people with hip or knee osteoarthritis. Clinical guidelines recommend aquatic programs lasting 30 to 120 minutes, one to five times per week, to improve range of motion, strength, balance, and function.
Common Low Impact Activities
- Walking: The most accessible option. One foot is always on the ground, keeping peak forces at or below 1.5 times body weight. Brisk walking for 30 minutes a day provides meaningful cardiovascular benefit.
- Swimming: Water supports your body, eliminating ground impact entirely. Leisurely swimming sits around 6 times resting metabolism, while vigorous lap swimming reaches nearly 10 times. Butterfly stroke is one of the most demanding exercises in any category at almost 14 times resting metabolism, all with zero joint impact.
- Cycling: Whether outdoors or on a stationary bike, cycling removes landing forces completely. Light leisure riding burns energy at about 6.8 times your resting rate, and faster riding pushes past 10.
- Elliptical training: Your feet never leave the pedals, so there’s no ground strike. The machine guides your legs through a smooth arc that mimics running without the impact.
- Yoga and Pilates: Controlled, slow movements with no jumping or pounding. These build flexibility and stability while keeping joint stress minimal.
- Rowing: Seated and fluid, rowing works the entire body through a pulling motion that loads muscles without impact.
Can You Build Muscle With Low Impact Training?
Yes. Research published in the Journal of Applied Physiology found that low-load resistance training produces muscle growth comparable to heavy lifting, as long as you push each set close to the point where you can’t complete another rep. Over nine weeks, participants using lighter weights saw about an 8% increase in muscle thickness, with no significant difference compared to the heavy-load group. This held true for both overall size and changes at the cellular level.
This is particularly relevant for low impact exercise because many joint-friendly options (resistance bands, bodyweight circuits, light dumbbells with higher reps, Pilates) fall into the low-load category. The key variable isn’t the weight on the bar. It’s whether you’re working hard enough within each set. If you reach the point of genuine muscular fatigue, the growth stimulus is essentially the same regardless of how heavy the resistance is.
The Bone Density Trade-Off
This is where low impact exercise has a genuine limitation. Bones need mechanical stress to maintain or build density, and low impact activities often don’t provide enough of it. Walking alone does not improve bone mass. It can slow the rate of loss, but it cannot reverse it. Research on postmenopausal women found that walking had no significant effect on bone density at the spine, wrist, or whole body. The one exception was the femoral neck (the top of the thigh bone near the hip), where walking programs longer than six months did show a small positive effect.
The most effective exercise for bone density at the hip is progressive resistance strength training for the lower body. For the spine, combination programs that mix weight-bearing activity with resistance training outperform any single approach. Jogging combined with stair climbing and walking can slow bone loss at both the hip and spine in menopausal women, likely because those mixed activities generate enough ground reaction force to stimulate bone remodeling.
If you rely entirely on low impact exercise, adding some form of resistance training is important for long-term skeletal health. This doesn’t require high impact. Heavy squats, lunges, and deadlifts load the skeleton through muscle force rather than landing force, making them joint-friendly while still stressing bone effectively.
Who Benefits Most From Low Impact Exercise
Low impact training is the default recommendation for several groups. People with osteoarthritis benefit because reduced joint forces mean less pain during and after exercise. Current clinical practice guidelines for hip osteoarthritis specifically recommend individualized exercise programs, including aquatic therapy, performed one to five times per week over periods of five to 16 weeks to improve motion, strength, and pain.
People recovering from joint surgery, stress fractures, or tendon injuries typically start rehabilitation with low impact movement before progressing to higher-impact activities. Pregnancy, obesity, and older age are other common reasons clinicians steer people toward low impact options, not because these groups can’t exercise hard, but because the risk-to-benefit ratio of repeated joint pounding shifts unfavorably.
For people without joint concerns, low impact exercise is still a valid long-term strategy. Cycling, swimming, and rowing can sustain cardiovascular fitness for decades without the cumulative wear that high-mileage running sometimes causes. Many competitive athletes use low impact cross-training to maintain fitness while giving their joints recovery time between high-impact sessions.