My recommendation is for you to know that when oxygen
is in the body your nervous system and muscles are most
engaged and tense. As you breathe in and out your body's
muscles go from tense to relaxed in corresponding cycles.
So first of all always keep breathing and avoid holding
your breath. My discovery was to breathe more specifically
and thus make it an exercise.
Experiment yourself by breathing in cycles like this:
on your in breath breathe a little harder to make it short.
Then on your out breath breathe out of your mouth and
make it longer and most importantly just hold your breath
out and lay there on the massage table for as long as
you are comfortable without air in your system. Then resume
breathing in and repeat. If you keep it up you will effectively
receive most of your massage on the out breath. You are
offering your body, muscles, emotions and nervous system
in their most let go state for the practitioner to heal
and relax you. As I came upon this and did it, I found
myself experiencing a sublime massage and slipping away
into a deeply relaxing meditative state.