Un-ask the question. You seem to be applying the word truth as a binary proposition (IE. it's a rib-eye steak or it's a Chevrolet) and it is based on an assumption that any single truth must be true for all.
It is a question of frame of reference, truth having no relevant or scientific meaning here.
Every object is moving in relation to every other and that goes for every atom in the entire universe, relativity applying to each and every one. As JohnnyMo1 sais, nothing travels at the speed of light (not even light, but don't get me onto that!)
Tau (http://en.wikipedia.org/wiki/Tau) may approach zero with continuous propulsion, but even this for the length of the universe will not reach C, only approach it. Using E=mC^2 it would take approximately the average male (59Kg) more than Eta joules to apply the force needed to accelerate and decelerate his body to get within a fraction of a percentage of the speed of light. The closer to that speed the more energy is required to make significant progress.
Further, to do achieve anything like this within your lifetime, he would be subjected to such forces of acceleration/deceleration - same thing), that all you would get back would be a layered organic mass, unrecognizable as human.
BTW give my regards to your hypothetical and mushy friend. :)