Serious Fitness Lab
You have followed countless programs, but lasting results remain elusive. Time to take a different approach.
We help you with scientifically based knowledge and practical strategies for a fit and vital life - without temporary solutions, but with lasting change.
Train Smarter with Science
In science, we dive deep into the science behind training, health, and performance. Whether you want to become stronger, faster, or fitter, here you'll find evidence-based insights, practical tips, and the latest research on fitness and movement. No myths, just facts - so you can train smarter and achieve optimal results.
Workouts That Help You Train Smarter
Discover complete training schedules for every muscle group, designed to boost strength, muscle mass, or endurance. Backed by science and practical experience, our workouts emphasize proper technique, guided by instructional videos, and proven routines for maximum progress. Train efficiently, safely, and with purpose.
350+ workout plans
Fitness App for Smarter, Stronger Workouts
Always have your personal trainer in your pocket, whether you’re at the gym or training at home. The app offers complete training plans and individual exercises with clear video instructions. Get ready-made plans for every level, personalize your workouts, and track your progress with ease.
Discover our app
The Truth About Fat Loss and Muscle Growth
Sander Kers debunks fitness myths with two clear, science-based books. Start with Serieus over Afvallen, no nonsense, just facts. As you progress, you’ll discover the second book packed with practical strategies for real muscle growth.
Serious about fitness with Kers and Klok
Join Sander Kers and Tijs Klok every Wednesday with a new podcast episode – sharp, science-based, and with a touch of humor. In just 20 minutes, we dive into the world of fitness and health. We break down facts, bust myths, and answer listener questions, always backed by science, never boring.
Looking for a podcast that motivates, informs, and makes you laugh? Grab your headphones, start your workout (or chill moment), and tune in!
