Which type of exercise is most appropriate for promoting flexibility?

The most appropriate type of exercise for promoting flexibility is static stretches or partner-assisted stretching exercises. These techniques specifically target the muscles and connective tissues, encouraging them to lengthen and improving the overall range of motion in joints. Static stretching involves holding a position for an extended period, which helps to gradually increase flexibility by allowing the muscles to adapt to that new length.

Partner-assisted stretching can further enhance flexibility, as a partner can provide support and help to attain deeper stretches that might be difficult to achieve alone. This type of engagement can facilitate greater muscle relaxation and stretch deeper tissues.

In contrast, aerobic running focuses more on cardiovascular health and endurance rather than flexibility. Weight lifting concentrates on building muscle strength, and while some weight lifting exercises may involve a range of motion, they do not specifically develop flexibility by design. High-intensity interval training (HIIT) is geared towards improving fitness and athletic performance through bursts of intense activity, which again does not directly promote flexibility. Thus, static stretches and partner-assisted exercises are the optimal choice for enhancing flexibility.