Human legs can only run so fast: Here's why

So far, the fastest any human has run is about 27 1/2 mph, a speed reached (briefly) by sprinter Usain Bolt just after the midpoint of his world-record 100-meter dash in 2009.

Do people with long legs run faster than people with shorter legs? - Quora

Heavy Legs When Running? Top 10 Reasons and How to Fix Them!

Heavy Legs When Running? Top 10 Reasons and How to Fix Them!

The Human Body Is Built for Distance - The New York Times

How Do Cheetahs Run So Fast? - Lesson for Kids - Video & Lesson Transcript

Usain Bolt is the fastest human in the world—here's the science that shows how he does it

Running - Wikipedia

Never Skip a Leg Day: Benefits, Cautions, and More

Yes, Running Builds Muscle, Especially in Your Legs

How long does it take for legs to stop hurting after running? I'm running 2 kilometers every day for the past 12 days, but every time I stop, my legs hurt so

Walking Upright The Smithsonian Institution's Human Origins Program

Extremely steampunk leg attachments could let humans run 46 miles per hour

Would humans run faster if they ran with their legs and arms? - Quora

Overexercising: Signs, Complications, and Outlook

Do people with long legs run faster than people with shorter legs? - Quora