How do jetpacks work?

The first challenge with the design of any jetpack is how to get the pilot off the ground without burning his legs off below the knees.

How Hydroflight Works-Diagram - Jetpack America

How a jetpack design helped create a flying motorbike

Real Sports' 'Rocket Men' shows off how far jetpacks have come

Jetpack Racing is Coming Soon - Bricsys Blog

How do astronaut jetpacks work? - Quora

How to make a JETPACK in ROBLOX (like Jailbreak!)

Inside Gravity's daring mission to make jetpacks a reality

I made a Working Minigun Jetpack. My first creation out in the workshop. : r/peopleplayground

Jetpack Firefighters, How does it work? – X Jets – Jetblades and Jetpacks, Hydroflight Sport Equipment

Jet pack - Wikipedia

What is Android Jetpack?. Android Jetpack is a set of components…, by Asfak Saiyed, AndroidPub