Why we make it increasingly easy for ourselves and why this easiness can impede muscle growth is this week’s topic in Tutorial Thursday #25. Yet again another bold claim but let me explain it first. Training with a barbell, dumbbell or a pull up bar is effective in a way but it is also very comfortable in another way! The average barbell has a grip diameter of 30mm. It is the same with dumbbells and pull up bars. But why is that so?