Say my spacecraft is traveling c, and I'm walking .5 m/s towards the front of the spacecraft. Would that not mean I am traveling faster than light? I'm sure everyone has seen movie where a ship is traveling at the speed of light, while someone is moving about the cabin. I know only photons can only travel at light speed, but hypothetically speaking, wouldn't it be impossible to live while traveling c? You're heart can't pump itself any more forward, or it would be traveling faster than light. I know it's a stupid question, but I can't seem to find the answer anywhere else online.