it is when you flip and tuck your legs in
A back tuck is a tumbling move. In a back tuck, the body is curled up tightly into a ball. The knees are as close to the chest as possible, with the hands clutching the knees. By "tucking" together tightly in this manner, the body is able to reach maximum angular velocity, thus minimizing the time required for the body to complete its revolution.
arms up and jump and while you jump, tuck at the same time
you tuck and role
No a back hand spring is when you do a real fast back walkover with you feet together. A back flip is also known as a back tuck and that's when you flip in the air.
There is not a big difference.In a front flip, you do not have to tuck in your feet/calfs, however with the front tuck, your hands have to be wrapped around your feet and bottom part of your legs. So, a front tuck would be a bit easier for some people, and a front flip would be easier for other people.
Jump and tuck your head and exhale through your nose and just keeping practicing!! 
A tu is when a gymnast folds her knees into her chest. This can be done in a jump or a flip.
a back tuck a full you go pretty much in a circle in all of the flips
The difference is that a back tuck is where you jump in the air and basically do a backwards somersault. A back handspring is where you prep, the jump backwards ( like when you start a race that is backstroke) and put your hands on the floor, then keep going backwards for the rest of the rotation until you get back to a standing position.
you push off the wall with your feet and tuck your knees. then you flip over.
They might call it a free cartwheel, a salto, an aerial, somi, tuck, layout, or pike.
To flip a person you need to have strength You start by deciding how your going to flip them For a back tuck grab the back of their shirt and put your other hand on their thigh then count for them as they are flipping over use your hand that is holding their shirt to keep them from falling use the other hand to help them flip over Make sure they squat and then jump the faster you get over the better