Fitness Industry Insights

How Long Should You Rest Between Sets?

Haris Ruzdic

Published on: 23/03/2026

Rest between sets affects strength, muscle growth, and training performance. Learn how long you should rest depending on your training goal.

Diet Soda, Aspartame, and the Truth: A Coach Haris evidence based guide

Haris Ruzdic

Published on: 16/03/2026

Is Diet soda dangerous? This evidence based guide explains the science behind aspartame, cancer risk, and what research actually shows about artificial sweeteners.

Best Rep Range for Muscle Growth: What Science Says

Haris Ruzdic

Published on: 09/03/2026

What is the best rep range to build muscle? Research shows muscle growth can occur across a wide range of repetitions when training effort is high.

Zone 2 Cardio Explained: What It Is and Why It Improves Endurance and Longevity

Haris Ruzdic

Published on: 02/03/2026

Zone 2 cardio improves endurance, metabolic health, and cardiovascular fitness. Learn what Zone 2 training is, how it works, and how it fits with strength training.