Trusted • Evidence Reviewed • Scientific Guides

Research Hub

Carefully curated scientific guides and research insights, reviewed for accuracy, clarity and evidence-based consistency.

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Caps and sun protection according to headform and modelling studies

A cap gives only partial sun protection: headform measurements found that a peaked cap protects the nose well but is relatively ineffective at other facial sites, and a modelling study found that no hat style gave full protection at any facial zone (highest...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Is a fleece hoodie warm enough for winter training? The insulation research

Is a fleece hoodie warm enough for winter training? Not reliably, going by the research: trapped air gives clothing its insulation, but walking, cycling and wind all reduce it, and no study we found tests a fleece-lined hoodie directly, so treat it as a war...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Quick dry fabric in gym shorts: wearer trials, manikin tests and textile data

In most wearer trials, polyester and cotton clothing produced similar core temperature, heart rate and performance, so a quick dry fabric label is not evidence of a cooler or faster workout. Quick dry fabric is a common claim in sportswear descriptions, so ...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Gym shorts UK buying checklist: fit, fabric and pockets

Before buying gym shorts in the UK, check five things: length, fit, fabric, pockets and care. This gym shorts UK checklist explains each one in plain English, shows what the sportswear research does and does not tell us, and uses the Free Muscle Gym Shorts ...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Cotton vs polyester gym t-shirt across human trials and two reviews

Most trials comparing cotton with polyester during exercise found no meaningful difference in core temperature, heart rate or comfort ratings, and two reviews reach the same overall conclusion. For the cotton vs polyester gym t-shirt question, this guide se...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Does washing reduce sports bra support? Results from a 25-wash study

Does washing reduce sports bra support? In a 25-wash intervention study, breast motion rose in the washed bras and participants noticed reduced support (Wakefield-Scurr et al., 2024). In the studies reviewed here, seamless knitting refers to fabrics and gar...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

How should a seamless gym set fit? Bra, leggings and sizing checks

How should a seamless gym set fit? It should fit well enough to control breast movement, and the research suggests checking that deliberately rather than guessing: in one study of 104 women, 85% were wearing an ill-fitting bra, and in a treadmill study of 2...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

What should you look for in a gym hoodie in the UK? Fabric, fit and care

What should you look for in a gym hoodie in the UK? Four things decide whether you wear it for years or leave it in a drawer: how heavy the fabric is, how it fits, which size is right, and how you wash it without ruining it. This guide works through each de...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Should you size up? Gym t-shirt UK sizing, cut and care explained

Whether to size up in a gym t-shirt UK shoppers compare comes down to the fit you want: for the Free Muscle T-Shirt, the product page says to size up for a relaxed fit and to order your usual size otherwise. Searching for a "gym t-shirt UK" turns up a long ...

Scientific Guide Trusted Evidence Reviewed

Published October 03, 2026

Buying a cap? Gym cap UK fit, size band and care to check first

If you are buying a gym cap in the UK, check three things first: fit, size band and care. Picking a gym cap you will still like after a few months comes down to three practical questions: does it fit your head, can you adjust it, and will it stay tidy when ...

Scientific Guide Trusted Evidence Reviewed

Published September 27, 2026

What is in a PCT blend? Ingredients, evidence and UK status

Products sold as PCT blends or PCT supplements may contain SERMs such as clomifene and tamoxifen, which are prescription only medicines, the unlicensed isomer enclomiphene, aromatase inhibitors, or herbal and nutrient ingredients such as tongkat ali, D-aspa...

Scientific Guide Trusted Evidence Reviewed

Published September 27, 2026

Is HGH legal in the UK? Somatropin, prescriptions and the law

Somatropin, the medicine usually meant by HGH, is a prescription-only medicine and a Class C controlled drug in the UK. This guide explains both legal layers, the Human Medicines Regulations 2012 and the Misuse of Drugs Act 1971, what Schedule 4 Part II mea...

More Free Muscle guides: English · Deutsch · Español · Italiano · Polski · Български · Română

← Previous 1 2 3 4 5 6 Next →

Account

Research Hub

Caps and sun protection according to headform and modelling studies

Is a fleece hoodie warm enough for winter training? The insulation research

Quick dry fabric in gym shorts: wearer trials, manikin tests and textile data

Gym shorts UK buying checklist: fit, fabric and pockets

Cotton vs polyester gym t-shirt across human trials and two reviews

Does washing reduce sports bra support? Results from a 25-wash study

How should a seamless gym set fit? Bra, leggings and sizing checks

What should you look for in a gym hoodie in the UK? Fabric, fit and care

Should you size up? Gym t-shirt UK sizing, cut and care explained

Buying a cap? Gym cap UK fit, size band and care to check first

What is in a PCT blend? Ingredients, evidence and UK status

Is HGH legal in the UK? Somatropin, prescriptions and the law

Shop

Help

Contact