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trampoline 
Apparatus made up of a bed stretched by springs; the gymnasts perform acrobatic freestyle by jumping and bouncing on it.
safety pad
Cushioned mat covering the frame to prevent injuries to the gymnast.
bed
Canvas that is usually made of nylon; the gymnast bounces and performs acrobatic freestyle on it.
frame
Metal body supporting the bed by means of springs; for competitions, the frame is 1.15 m above the floor.
spring
Metal elastic coils that stretch the bed; a trampoline usually has 120 springs.
leg
Metal structure supporting the trampoline frame.
