This can get tricky but practice with different light weight objects. To be absolutely technical about this, the thrust coming off the propeller will blow against the bottom of the blimp bag resulting in a downward force known as Bernoulli's principle. A very slight positive angle of attack will compensate. You do not need to push the blimp. The blimp will now start it's voyage, taking several seconds to accelerate.
Some people even call it therapy.
Games can be played with two or more people flying it back and forth. You can make a tether for the blimp with thread. Make a loop in the thread at one end and tape it to the front of the blimp. Then make a loop at the other end and attach it to a pole that has a nail on one end. See Figure 5.