Triple extension describes which of the following actions?

• A. Simultaneous extension of hips, knees, and ankles
• B. Flexion of hips and knees
• C. Only knee extension
• D. Simultaneous extension of hips and ankles

Answer: (A)

Triple extension is the simultaneous extension of three major joints in the leg: the hips, knees, and ankles. This coordinated action lets the body push off the ground with maximum propulsion, which is why you see it in explosive movements like jumping and sprinting. The best description matches this by stating that all three joints extend at roughly the same time. The other options don’t fit because they describe flexion, or they involve only one or two joints instead of all three.