Road to Yoga Day — 21st Jun : Bhramari Pranayama

Veghādghosham pūrakam bhrngghanādam
Bhrngghīnādam rechakam mandamandam
Yogīndrānamevamabhyāsayoghāch
Chitte jātā kāchidānandalīlā
By filling the air with force, making noise like Bhringi
(wasp), and expelling it slowly, making noise in the
same way; this practice causes a sort of ecstacy in the
minds of Yogîndras.
(From Hatha Yoga Pradipika)
https://m.youtube.com/watch?v=d_Dn97Hn6uE
This is a widely circulated video and a simple one to observe & follow. The details about this great technique is available in the video.
Benefits of Bhramari Pranayama
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1. Mind gets absorbed in this pleasurable and soothing vibratory sound.
2. Stress reducer
3. Eliminates anxiety
4. It also stimulates the hypothalamus, the pineal and the pituitary glands
5. Eliminates throat ailments
6. Strengthens & improves the voice
7. Helps in the enhancement of memory & concentration
The practice can be combined with :
1. Ujjayi pranayama
2. Om chanting
3. Jalandhara & moola bandhas (with the help of trained teacher)
4. Shanmukhi mudra
Please do not practise it while lying down. Also, people with severe infections should not practise.