Because flexible board gives opportunity to regulate loads in asanas, some interesting researches were carried out to find out how meditative state of mind depends on loads in asanas.

1. (0-F1) limited loads close to zero; meditation appears after short period of time.
2. (F1-F2) with some efforts to relax one may reach after some period of time positive sensations (pleasure, joy); meditation appears sometime;
3. (F2-F3); with some efforts to relax one may remove discomfort and reach neutral sensations; there are no meditation in asana.
4. (F3-F4) with some efforts to relax one may reduce discomfort but not completely and after some period of time you quit; There is no meditative state.
5. (> F4) range of loads when increasing discomfort or pain appears and you cannot relax at all; asana performs only short period of time; there are no positive sensation in asana.

As far as I know begginers practice most yoga asanas within the ranges C and D when there is no meditative state and only some asanas like (savasana, paschimotasana) may be performed within the ranges A and B.

Masters of yoga and men with good flexibility are able to practice most asanas within the ranges of loads B and C and reach meditative state;

With the help of flexible board everyone may perform asana and may reach its form and also may reduce asana's loads to ranges (A-C) e.g. reach positive sensation or meditaton.