WASHINGTON (Reuters) -Butch Wilmore and Suni Williams, the U.S. astronauts left on the International Space Station last year by Boeing's troubled Starliner capsule, are on the up after returning to Earth in March, emerging from weeks of physical therapy to ramp up work with Boeing and various NASA programs. "Right now, we're just coming off of the rehab portion of our return," Wilmore, 62, told Reuters in an interview on Wednesday. Wilmore and Williams, who last year set off for an eight-day Starliner test flight that swelled into a nine-month stay in space, have had to readapt their muscles, sense of balance and other basics of Earth living in a 45-day period standard for astronauts returning from long-term space missions.