Instead of having to get down on the floor every time you want to work your abdominal muscles, build your own sit up bench for workouts. A properly constructed sit up bench needs an incline surface that remains stable against your back and a place to anchor your feet to ensure the proper form. The sit up bench also needs to be long and wide enough support your body.
Use two bent pieces of thinwall electrical conduit for the base of the sit up bench. These tubes should be 5 feet long and 1 inch in diameter. The ends of the tubes will form the legs of your bench. The longest leg needs to be 17 inches, bent at a 50-degree arc, while the shortest leg needs to be 12 inches, bent at a 70-degree arc. The shortest legs are where your head will be when doing sit ups.
Drill bolts, preferably 1/4-by-2 1/2 inches, through the middle of the legs and the base of the 2 thinwall electrical conduits to hold them together.
Place a 20-by-11 1/2-inch wooden board over the center of the tubes so that 4 inches of the end over the board extend past where the shorter legs begin.
Drill bolts, preferably 1/4-by-2 inches, through the wooden board and into the tops of the two pipes.
Attach a 16-inch piece of thinwall electrical conduit, running perpendicular, about 8 inches up from the bottom of the longest leg. Secure it in place with contact cement and a bolt, if needed.
Wrap the ends of the 16-inch pipe with pipe insulation so that it is more comfortable against your ankles when you are performing a sit up. Place furniture tips on the bottom of the legs to keep the bench from sliding.
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