A chest-developing exerciser is disclosed to include a retractable main
shaft, a wheel pivotally provided at the bottom end of the main shaft,
two handlebars respectively coupled to the top end of the main shaft at
two sides, a support bar pivotally connected to a middle part of the main
shaft, two foot bars bilaterally provided at the bottom end of the
support bar remote from the main shaft, two holder frames respectively
fixedly provided at the main shaft and the support bar, and spring
members connected between the holder frames.