Does performing yoga and meditating increase your chances of demonic possession?

WOW! How do you know this? Who told you?
All the strange meditations put you in touch with the spirits of demons.
@. nineteenthly: regardless of being with God, that form of meditation is a call to the spirits, you will see it with possible strange things that happen with time.

No.  If you can't see the unity between Yoga and walking with God, you are not walking with God.

All the demons are in hell


2 Peter 2:4 KJV — For God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment.

No.  In fact, controlling your breathing is very healthy.  I do TaeKwonDo, and i'm a black belt.  Ever since the first day, up until now, the first thing I learned, was self control.  Controlling your heart beat, meditating, and doing yoga, is very healthy for your breathing, and heart.  It also increases your self control in very different scenarios.  Doing these exercises, you can control your anger, sadness, happiness, and many other emotions.  I used to have a very low self esteem, but after stretching, meditating, and controlling my pulse, my confidence in life has really gone up.  I am a Christian by the way, and I can assure you that no such thing would ever happen.  Worst case scenario, you might twist your neck too fast, or fall from balancing, but other then injury, possession doesn't happen, nor has it ever happened.

Of course not. It is nonsense ideas like that that cause people to think Christians are under educated and cranks. If they want to be taken seriously they need to stop it.
  

No, but it can increase your longevity and physical health, so that's even more terrifying.

Almost certainly, since Yoga is an eastern discipline intended to facilitate human interaction with the demonic.

Yoga—Just an exercise or something more? Read this article: https://www.jw.org/finder?wtlocale=E&docid=2002565&srcid=share

no,,, yoga is just a means of stretching and movement.. no worship involved

No such thing as demons so the answer is no.