Bodyweight training. Pushups & Pullups

Bodyweight exercises are strength training exercises that do not require free weights or machines. Instead you are using your own weight, which provides resistance against gravity. It is recognised that bodyweight exercises can improve a range of biomotor abilities including strength, power, endurance, speed, flexibility, coordination and balance. Bodyweight training has grown in popularity for both recreational and professional athletes, with a range of sports disciplines using bodyweight resistance training as part of their fitness programs.

Bodyweight training consist's of pushing, pulling, squatting, bending, twisting and balancing.
Movements such as the push-up like you can see Andreas doing in this video, the pull-up which Andreas also performs in this clip, and the sit-up are some of the most common bodyweight exercises.