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I know I'll regret this, but here goes.
If I watch an object accelerate past me this requires additional energy being added to the object to make it accelerate. So the object has more mass. This one more or less makes sense. Except if the object is a photon.
Now if I accelerate myself I must use energy to do that. But you say I don't gain mass in my reference frame. Where in my reference frame does the energy manifest itself and what is stopping me getting to C if I have the same mass?
Some explanations of relativity make perfect sense and it doesn't seem that hard. Others make me think I never really understood it at all.
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