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.

Protein RDA: It Took Them About 50 Years

Haris Ruzdic

Published on: 06/02/2026

The protein RDA was designed to prevent deficiency in times of food scarcity. This article explains why higher protein intake became the real standard, to support strength, recovery, or long term health.