An exercise system includes an elastic cord assembly including an elastic
and plugs. The elastic has a first and second end and a stretch between
the first and second ends. One of the plugs is inserted into the first
end and another one of the plugs is inserted into the second end. At
least one strap assembly is slidably attached to the elastic cord
assembly. The strap assembly includes a block having an aperture formed
from one side to another side of the block forming an unbroken wall
through the block. The strap assembly also includes a strap connected to
the block in a manner that forms a loop in the strap. The plugs retain
the strap assembly on the stretch of the elastic cord assembly between
the first and second ends.