Is this placebo or is it all in my head?

I’m a fat guy and for about 6 weeks, i’ve been working out with a personal trainer and eating extremely healthy. I finished my workout today and i’ve been feeling really good, happy inside the head and have a little more energy to do some chores. 6 weeks ago i wasn’t feeling like this so im trying to feel out if this is like a placebo effect or is this how your supposed to feel when u workout.
Is this placebo or is it all in my head?
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