In 2002, most full-time physical therapists worked a 40-hour week; some worked evenings and weekends to fit their patients' schedules. More than 1 in 5 physical therapists worked part time. The job can be physically demanding because therapists often have to stoop, kneel, crouch, lift, and stand for long periods. In addition, physical therapists move heavy equipment and lift patients or help them turn, stand, or walk.