Hanging upside is, generally, recommended for only a couple of minutes at a time. Find out about the dangers of hanging upside down for longer than that.
Cardiac Wellness Institute – Official Blog
What Are the Dangers of Using an Inversion Table?
Hang upside down for good health! - Times of India
Hanging Upside Down Benefits And Risks - BetterMe
The Spine: Benefits of Hanging Upside Down - Body In Balance
Why a two-minute 'upside down break' could be the daily boost you need
Everything You Need to Know About Wall Rope Yoga - Parade
Can Inversion Tables Really Relieve Back Pain?
Benefits of Hanging Upside Down - WSJ
Is it okay for a toddler to hang upside down? - Children's National