Sit-up exercise machine

Abstract

The present invention provides an improved sit-up exercise machine that can be used in sitting posture and functions to exercise several parts of belly, which comprises a sit-up chair and an underlay pivotally connected to the front of the sit-up chair. The chair consists of a back-support, a holding rod, and an adjustable axle seat. The adjustable axle seat is disposed on both sides of the chair, pivotally connects the back-support and the holding rod front and rear by pivot connection element on the top surface of the seat and adjusts the angle between the back-support and the holding rod in the range of several sections. Therefore, it can realize body-building and exercise of different parts of belly.

1 . An improved sit-up exercise machine that functions to exercise several parts of belly, comprising:
 a sit-up chair and an underlay pivotally connected to the front of the sit-up chair,   said chair consists of a back-support, a holding rod, and an adjustable axle seat,   wherein said adjustable axle seat is disposed on both sides of the chair, pivotally connects the back-support and the holding rod front and rear by pivot connection element on the top surface of the seat and adjusts the angle between the back-support and the holding rod in the range of several sections.   
   
   
       2 . The sit-up exercise machine as  claim 1 , wherein said underlay consists of a bottom support and a waist support extending backwards from the bottom support. 
   
   
       3 . The sit-up exercise machine as  claim 1 , wherein said underlay has notches on both sides thereof for grasp. 
   
   
       4 . The sit-up exercise machine as  claim 1 , wherein said underlay has anti-slip means. 
   
   
       5 . The sit-up exercise machine as  claim 3 , wherein said waist support is in shape of arc. 
   
   
       6 . The sit-up exercise machine as  claim 1 , wherein said back-support is retractable. 
   
   
       7 . The sit-up exercise machine as  claim 1 ., wherein said holding rod is retractable. 
   
   
       8 . The sit-up exercise machine as  claim 1 , wherein said adjustable axle seat can adjust the angle between said back-support and said holding rod in the range of four section. 
   
   
       9 . The sit-up exercise machine as  claim 8 , wherein the range of the first section angle is within 35°-45°. 
   
   
       10 . The sit-up exercise machine as  claim 8 , wherein the range of the second section angle is within 55°-65°. 
   
   
       11 . The sit-up exercise machine as  claim 8 , wherein the range of the third section angle is within 65°-75°. 
   
   
       12 . The sit-up exercise machine as  claim 8 , wherein the range of the fourth section angle is within 80°-95°.