There are many exoskeletons in development around the world. While the goal of some is to make your average human able to lift and carry more, the goal for others is to help people who are paralyzed to walk again. That latter is what the Phoenix exoskeleton is for. It features a fairly a simple design that also makes it one of the least expensive exoskeletons out there.
That isn’t to say the Phoenix is cheap, it still costs $40,000, which is big money, but is half the cost or less of comparable systems. The developers hope scale will bring the cost down to the price of a motorcycle or cheap car in the future, perhaps to the realm of $10,000-$15,000.
The only motors in the exoskeleton are in the hips, and the knees lock automatically. The user does have to use crutches or a walker to balance themselves, but it can still help them walk. A button on the crutches prods the legs forward by activating the motors in the hips. You can get an idea of how the exoskeleton works in the video above.