Running is not inherently bad for the knees; in fact, when done with proper technique and moderation, it can strengthen the muscles, ligaments, and cartilage that support the joints. Research shows that regular running can improve joint health by increasing circulation to the cartilage, helping nourish it and maintain its resilience. Most knee pain associated with running tends to result from overuse, poor biomechanics, inadequate footwear, or running on hard or uneven surfaces rather than the act of running itself.
However, running does place repetitive stress on the knee joint, and without attention to training volume, recovery, and body mechanics, injuries like patellofemoral pain syndrome or meniscus irritation can occur. Proper warm-ups, stretching, gradual increases in mileage, and strength training for the quadriceps, hamstrings, and hip muscles can help prevent knee problems. Overall, for most healthy individuals, running—done thoughtfully—supports knee health rather than damaging it.
