A backflip, also known as a gainer, is an acrobatic move in which the gymnast rotates 180° horizontally around the support of one arm, simultaneously swinging their free arm over their head.
The legs pass one another as the gymnast switches from a back hand spring to a front handspring.
The best way to do a backflip is to start with your feet together, shoulders back, and arms extended straight up in the air. With one hand, push off the ground while jumping into the air.
At this point of backflip your body should be at a 90 degree angle to the ground. Once you’ve rotated enough so that you’re parallel with the ground, both hands should come down and touch it.
The last thing you’ll do is use the momentum to jump forward.
So this is how to do a Backflip.