Pump is the first portable fitness machine with a built-in motor that cleverly controls resistance from start to finish, for a consistent pump that works your muscles evenly on every lift and pull. Designed by award-winning robotics engineers and fitness experts, PUMP anchors to any doorway, chair, and even your ankle to unlock 1000s of workouts… with zero elastics.

Gyms are overpriced and crowded. Home equipment is bulky and awkward. And busy people are desperately trying to get fit using minimal workouts that lack resistance.

The travel-ready Unitree PUMP solves all that by bringing powerful workouts to anywhere. PUMP helps you skip the excuses, and get better pumps from your home, hotel, office or friend’s house.

Every workout is different, and every muscle has different needs. Find the perfect resistance for any exercise and adjust it with a few taps on the app. PUMP lets you pinpoint the perfect resistance from 4.4 - 44lbs, or more if you combine PUMPs.

The amazing thing about PUMP is that it lets you choose between eccentric and concentric resistance. That means you get the option to feel more burn on the way up, on the way down, or both equally. PUMP provides you with 4 training modes: Concentric mode, Eccentric mode, Constant mode, and Chain mode.

In PUMP’s concentric mode, you can customize resistance from 11 - 44lbs (5-20kg) and a ratio from 0-50%. That means if you set the resistance at 20lbs and the ratio at 20%, the resistance when pulling the rope will be 20lbs, while the resistance of the rope rolling back will be 16lbs.

According to kickstarter.com