While passive flexibility involves using external forces to help find a stretch, active flexibility involves using your muscles to support a stretch, or get stronger in that a stretched position.
2018 vs 2020 and im almost crying im so happy :') : r/flexibility
Electrum Fitness
Passive Stretching is Not the Devil — Dani Winks Flexibility
Friendly reminder: stretching should never hurt! (And some more thoughts on stretching intensity) : r/flexibility
4 Ways to Become Flexible - wikiHow
Passive Stretching: Benefits, Examples, and More
Work Your Active Split Flexibility with Front Split Slides — Dani Winks Flexibility
What is “Active Flexibility” and Why is It So Important? — Dani Winks Flexibility
4 Active Hamstring Stretches for Beginners — Dani Winks Flexibility
Friendly reminder: stretching should never hurt! (And some more thoughts on stretching intensity) : r/flexibility
Modernize your stretching routine with dynamic flexibility training
Active Flexibility — Bendy Blog — Dani Winks Flexibility