Final answer:
The hip joint and the knee joint allow movement of the leg at the hip to improve running technique.
Step-by-step explanation:
The hip joint and the knee joint allow movement of the leg at the hip to improve running technique. The hip joint is a ball-and-socket joint that connects the head of the femur to the acetabulum of the hip bone, providing stability during weight bearing.
The knee joint is a modified joint between the femur and tibia, allowing for knee extension and flexion. This mobility is vital for stride length and efficient propulsion during running. Simultaneously, the knee joint, a joint, supports the leg's flexion and extension, aiding in shock absorption and stability.
Together, these joints contribute to the fluidity and precision of leg movements, enabling runners to optimize their technique, maintain balance, and achieve an effective and energy-efficient running stride.