Better how? Could it have more side effects sure. Better?
I train as a distance runner now. You learn VERY early that intensity is all in the mind.
I do not need some powdered trash for an adrenaline release when I lift (compound and heavy). I just visualize getting angry.
You would benefit from a few things. Beta-alanine helps tangible, particularly for endurance. The mechanism makes sense, it increase muscle carnosine stores (more so then carnosine) on a magnitude of 80% roughly.
I agree it's in the mind, but as you know the mind is just the brain. The brain works via chemicals, you can enhance your "will", snort cocaine for example, but on a lesser scale you can receive some benefit.
There is also something called the entourage effect, basically synergism, some compounds do create emergent benefits.
A little bit of sugar to sip on would help also, the glucose cause insulin release which antagonizes cortisol which is particularly problematic in endurance.
You might even do better with a mild sedative rather then a stim for a run to be honest. Some cannabinoids
