in a user has an elastic bag capable of expanding and contracting the bag having an inlet and a pipe with a bag engaging flange around one end connected to the bag inlet and a normally closed check valve on the one end for preventing air in the bag from escaping when the check valve is closed the one end of the pipe and the check valve are made of elastic material and the normally closed check valve has the surface engaged with the pipe defined by a spiral cut around the periphery of the pipe and the valve is operable by bending the pipe to open the spiral cut application_number US 89931192 A description a preferred embodiment of the present invention will now be explained with reference fig1 through 5 in fig1 there is shown an apparatus for supporting deep breathing 1 which basically comprises a rubber balloon bag 2 capable of expanding and contracting a pipe 5 for blowing air connected to an inlet 2a of the rubber balloon 2 and a check valve 10 provided on an air discharge hole 9 of the pipe 5 shown in fig2 the whole of the pipe 5 is formed of soft synthetic resin such as rubber urethane and the like and includes as shown in fig3 an air passage 6 the check valve 10 and a flange part 7 8 denotes an air inlet hole for blowing in.