The Rebuild Library

Anatomical illustration of the shoulder, representing the four rotator cuff muscles

The Rotator Cuff Explained: What Each of Your 4...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: "Rotator cuff" isn't one muscle — it's four, and each has a different job. Subscapularis rotates your arm inward and...

The Rotator Cuff Explained: What Each of Your 4...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: "Rotator cuff" isn't one muscle — it's four, and each has a different job. Subscapularis rotates your arm inward and...

Athlete stretching, representing the differences between muscle, tendon, and ligament healing

Muscle vs. Tendon vs. Ligament: Why They Don't ...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: Muscle has the richest blood supply of the three, so it typically comes back fastest — a mild strain is...

Muscle vs. Tendon vs. Ligament: Why They Don't ...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: Muscle has the richest blood supply of the three, so it typically comes back fastest — a mild strain is...

Collagen supplement powder and a glass of water, representing collagen dosing for tendon health

Does Collagen Actually Help Tendons? What The D...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: Dose and timing both appear to matter. In a controlled study, 15 grams of gelatin plus 48 milligrams of vitamin...

Does Collagen Actually Help Tendons? What The D...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: Dose and timing both appear to matter. In a controlled study, 15 grams of gelatin plus 48 milligrams of vitamin...

Close-up of tendon and connective tissue during training, representing tendon adaptation over time

How Long Does It Actually Take For a Tendon To ...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: There's no fixed number of days. The largest review of tendon-loading studies to date (27 studies, 264 people) found measurable...

How Long Does It Actually Take For a Tendon To ...

Austin Martin Founder, Future Strength Labs · NASM-CPT Short answer: There's no fixed number of days. The largest review of tendon-loading studies to date (27 studies, 264 people) found measurable...

Hip Flexor Pain From Sitting All Day (And How T...

Short answer: Hip flexor pain from sitting almost always comes from your hip flexors — mainly the iliopsoas — spending 8+ hours a day locked in a shortened position, then...

Hip Flexor Pain From Sitting All Day (And How T...

Short answer: Hip flexor pain from sitting almost always comes from your hip flexors — mainly the iliopsoas — spending 8+ hours a day locked in a shortened position, then...

Person icing a sore joint after training, representing chronic tendon pain that hasn't resolved

Why Tendonitis Won't Go Away (And How To Fix It)

If tendon pain keeps coming back no matter how much you rest it, rest was never going to be the fix. Here's the real mechanism behind stubborn tendonitis and what...

Why Tendonitis Won't Go Away (And How To Fix It)

If tendon pain keeps coming back no matter how much you rest it, rest was never going to be the fix. Here's the real mechanism behind stubborn tendonitis and what...