Which physical activity is commonly associated with improving flexibility?

Yoga is widely recognized for its effectiveness in improving flexibility. This ancient practice involves a series of postures and stretches that specifically target different muscle groups. The slow and controlled movements in yoga encourage the elongation of muscles and tendons, enhancing the range of motion in the joints. In addition to flexibility, yoga also promotes balance, strength, and relaxation, making it a holistic approach to physical fitness.

While weightlifting and running have their own fitness benefits, they primarily focus on building strength and endurance rather than flexibility. Weightlifting can sometimes lead to tightness in muscles if not balanced with stretching. Running, while a great cardiovascular workout, involves repetitive movements that may enhance muscular strength and endurance but do not target flexibility directly. Swimming is excellent for overall fitness and range of motion due to its full-body movements, but it does not specifically emphasize flexibility to the same extent as yoga. Thus, yoga stands out as the most effective activity for improving flexibility among the options provided.