KRUGLOKnowledge

Knowledge

Not rehashed web articles, but real findings from building our evidence base. Every article follows the same structure: common beliefs, study results, and actionable steps.

Where the data is weak, we say so. Sounding confident without certainty is the fastest way to lose trust.

Contrary to common advice

Osteoporosis and heavy barbells

For decades, women with low bone density were advised to walk and avoid load. An eight-month study showed the opposite — and this is perhaps the most unexpected result of everything we have reviewed.

6 min read
By the numbers

How Many Sets a Muscle Needs

The answer depends not on how much you can do, but on how much you manage to recover from. And this relationship has a ceiling beyond which adding more stops working.

5 min read
Myth Clarification

Stretching Before a Workout

Static stretching before strength training temporarily reduces force output. However, the magnitude of this effect is usually blown out of proportion in secondary accounts.

4 min read
Mechanics

Why a calorie deficit stops working

It doesn't. What changes is how much you burn and how much you actually eat — and both changes happen unnoticed by you.

5 min read
Against conventional wisdom

What Women 'Cannot Do' — and What Is Actually True

Most of the restrictions that are still repeated were lifted decades ago or were never confirmed in the first place. There are few real differences, and they are not about bans.

7 min read
Contrary to common belief

Back Pain and Load

Bed rest for lower back pain worsens outcomes. This has been firmly established for a long time, yet the advice to "lie down" survives all refutations.

5 min read
Our decision

Why we don't have workout streaks

A consecutive-day streak counter is the most common feature in fitness apps. We deliberately removed it, and here is why.

4 min read