1. A system, comprising: a neural stimulator adapted to generate a stimulation signal adapted to elicit sympathetic activity at a neural target; a memory programmed with instructions for delivering a physical conditioning therapy that elicits sympathetic activity correlated to an exercise regimen to mimic a sympathetic response to the exercise regimen; and a controller configured to operate on the instructions to control the neural stimulator to intermittently elicit the sympathetic activity correlated to the exercise regimen at the neural target to provide the physical conditioning therapy.