Sit-up exerciser

Abstract

A sit-up exerciser has a body and a back bracket. The back bracket is mounted on and pivotally connects to the body. Multiple elastic elements transversely connect to the lower end of the back bracket and the body. When a user's back presses against the back bracket, the back bracket can be pivoted relative to the body. Meanwhile, the user should resist the resilient force of the elastic elements to keep exercising. Furthermore, the exerciser has a small volume for convenient storage.

1 . A sit-up exerciser comprising:
 a body having   multiple feet formed respectively on two ends of the body, and each foot having a distal end;   a back stretcher provided transversely in the body near one end of the body;   two fasteners formed on a middle portion of the body; and   a seat mounted on a top portion of the body near the other end of the body;
 a back bracket mounted on and extending upward from the body between the seat and the back stretcher and having 
 a lower end pivotally connecting to the fastener; and 
 multiple elastic elements mounted between the lower end of the back bracket and the back stretcher; and 
   armrest assemblies being mounted respectively on two sides of the body, and each armrest assembly having an armrest having a distal end being at the same level of the distal end of the foot of each side stretcher.   
   
   
       2 . The sit-up exerciser as claimed in  claim 1 , wherein
 the body has two parallel and curved side stretchers, and each side stretcher has two ends; and   the feet of the body are formed respectively on the two ends of the side stretchers.   
   
   
       3 . The sit-up exerciser as claimed in  claim 2 , wherein
 the body has a front stretcher mounted transversely in a low front end of the seat; and   each armrest assembly further has a mounting bar engaging the front stretcher; and   the armrest of each armrest assembly being curved and protruding backward and further having a proximal end connecting to the mounting bar.   
   
   
       4 . The sit-up exerciser as claimed in  claim 1 , wherein the back bracket has
 two rods respectively mounted pivotally on the fasteners of the body; and   multiple cylinders mounted transversely between the rods.   
   
   
       5  The sit-up exerciser as claimed in  claim 4 , wherein
 the back stretcher of the body has multiple evenly-spaced hooks;   the post of the back bracket has multiple hooks corresponding to the hooks on the back stretcher; and   each elastic element connects to one of the hooks on the back stretcher and a corresponding one of the hooks on the post.   
   
   
       6  The sit-up exerciser as claimed in  claim 5 , wherein the elastic elements are springs.