I always do! That and caffeine gels…
The way is see it:
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It only lowers RPE doesn’t actually increase physiological properties so therefore one still reaps same benefits from workouts
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It’s legal!!! and also easy to use in race situations so it’s not something you’ll be without come race day
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Pros train with it - as they do gels / electrolytes etc so why would one deny yourself something that enhances your abilities and chances of workout success…
And tbh if you are an “Olympic” level coffee drinker does it actually effect you as much as you think? Point being even if it’s just a Placebo then that’s great too!
Just my personal thoughts / experiences