Fit By Sci(ence) vs HealthyRebels

Supportive, Science-Based, and Actually Sustainable

I joined this group because I wanted a realistic, science-based approach to fitness and health without the noise, pressure, or gimmicks. What I’ve appreciated most is the tone of the community — supportive, encouraging, and grounded in real life. There’s accountability without judgment and education without overwhelm. This group meets you where you are, whether you’re consistent or coming back after a break. The conversations feel genuine, the guidance is practical, and it’s clear that sustainability and long-term health matter more than quick fixes. I’ve gained clarity, motivation, and a better mindset around progress, and I would absolutely recommend this community to anyone looking for a balanced, evidence-based approach to getting stronger and healthier — mentally and physically.

Donna Bittner · Jan 12, 2026

I'm 59 and type 2 diabetic.

I'm 59 and type 2 diabetic. Kerstin is a friend. Her guides and simple practical approach have helped me tremendously. One of the ones that stand out is the fasting guide. Thank you Kerstin!

Ayman Shalaby · May 21, 2026

Kerstin’s Healthy Rebels is as she...

The impression I get right away from Kerstin’s Healthy Rebels is as she describes the community “without pressure, perfection or quick fixes.” This especially speaks to over 50s such as myself who have tried other approaches to life and health. The community is very well organized with steps to get engaged, and she doesn’t miss a beat. She provides tips, insights, and even healthy recipes. It is clear she is all in herself, and with a calm and positive vibe. I especially like the recommended morning and night reset, as I do something similar. Finally, she keeps the community active as a leader and organizer. I would say all around, this is a good example of a community with promise.

Building daily habits and tips for healthy living

Building daily habits, and the tips and ideas about our healthy living