The Rein Blog
Training, supplementation, and recovery — broken down without the bro-science. Real, evidence-based guidance to help you get more out of every session and train for the long game.
What Actually Causes a Muscle Pump? The Science of the Pump (2026)
A muscle pump is trapped blood in a working muscle. Here's the real science behind it — and how to train and dose for a bigger one.
Why 10g of L-Citrulline Is the Pump Standard (And Why 6g Isn't Enough) in 2026
Most pre-workouts under-dose citrulline. Here's why 10g of pure L-Citrulline is the real clinical standard for pumps — and how to spot the label tricks.
