Someone posted a nice video of the Sarcos exoskeleton; unfortunately, I can't tell how old it is. However, it's informative and the exo is cool, so take a look.
(Sarcos exoskeleton video)
Two-hundred pound pulldowns are easy; you can lift 70 pound ammunition cases endlessly. You can run in the suit, and walk up stairs, all carrying heavy loads.
Although the model shown in the video is tethered by power lines, future models will carry battery backpack power. The Sarcos exoskeleton is also designed to carry on without its human wearer in an autonomous mode. Also, the company is designing the exoskeleton with different kinds of armored coverings.
Robert Heinlein discussed this idea with lots of details in his 1959 novel Starship Troopers; read what he has to say about a powered suit:
The real genius in the design is that you don't have to control the suit; you just wear it, like your clothes, like skin.
The secret lies in negative feedback and amplification.
Here's how it works, minus the diagrams. The inside of the suit is a mass of pressure receptors, hundreds of them. You push with the heel of your hand; the suit feels it, amplifies it, pushes with you to take the pressure off the receptors that gave the order to push.
(Read more about Heinlein's powered armor)
Mika The Robot-Boss
'the robot-boss was busy at the lip of the new lode instructing and egging the men on to greater speed...' - David C. Cooke, 1939.
Sensitive, Soft Robot Skin
'...tinted material that had all the feel and appearance of human flesh and epidermis.' - Harl Vincent, 1934.
Finger Sensors For Robot Hands
'What strange sensitivity! What an amazing development of science was manifested in every move and act and word of this Robot!' - Ray Cummings, 1931.
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Russians Think US Is Weaponizing Asteroids
'BY PUSHING AGAINST THE
LITTLE MARTIAN MOON WITH OUR
ROCKET SHIP, WE HAD LESSENED
THE CENTRIFUGAL SPEED THAT
HELD IT BALANCED IN THE SKY.'