Really interesting idea. As an amateur runner myself, I'm always interested in how I can run faster. My experience with personal fitness is this - there's neve

Really interesting idea. As an amateur runner myself, I'm always interested in how I can run faster. My experience with personal fitness is this - there's never just "one thing" you can do to make yourself run faster. Your entire body needs to be trained to the level to maintain performance. In the case of a jetpack - that means hips and legs have to be able to turn over rapidly, heart and lungs need to be match turnover rate, elasticity of tendons, adapt to impact forces on ankles/knees/feet, and muscles need to process energy efficiently. There's much more i'm sure. Basically - the only way this would work is if it was paired with an exoskeleton that would mitigate these issues to a large extent - for example, almost no force required from legs, with minimal turnover - using a "leaping" motion from the suit. So any fatso can move at a 4 min/mile. Otherwise, all I could see this doing is possibly making an already highly trained runner about 5-10% more efficient, but with zero military application as a standalone. Soldiers typically carry about 50-60lbs of gear already, so you'd be asking people to be highly trained runners with 50-60lbs of gear - plus a jetpack - sounds like a recipe for face-planting and injury. You would need an exoskeleton to manage the load. Then - this could get very interesting.