While sitting down in the ekoChakra_padmassana, it is important to carefully
adjust the resonator's exact position by hand before loading it fully with
body weight, to prevent it from getting damaged by overload. Unlike illustrated
on these pictures, I therefore recommend rather to put the legs first into
the lotus seat before sitting down onto the resonator, because this protects
the middle area of its vulnerable membrane from getting unnecessarily driven
into the 3rd operating range. Also pulling the feat close to the body helps
to avoid this.
Important is also that in this exercise the resonator must neither be inflated too much nor to little, because both can overload zones of its membrane by 3rd range operation. Despite it is unfortunately very difficult to find rubber glove sorts those as resonators are strong enough to survive bearing body weight for longer time.
I nowadays use inflatable medical latex sit rings instead, those are
designed to hold body weight. (In medical supply stores they tend to cost
horror prices. On eBay they are much cheaper.) For the ekoChakra_padmassana
also hot water bottle resonators can well be
used. They are also suited for heavier human beings.