In Āsana the use of metronome
should be limited and used as
a check on your breathing.
Such as, where you are using a
long Prāṇa breath one could use
a metronome to check the count.

Link to Series: 108 Postural Practice Pointers

Āsana and Mudrā Glossary
– Grouped into Standing, Kneeling,
Lying, Inverted, Backbend, Seated & Sitting