Prayer is a kind of simple ritual, a ritual which allows us to commune with the Universe. It involves not just the mind but the whole body.
It can involve incense and candles, opening your chakras, waving your arms, chanting holy names, praise, supplication and yearning. It is an expression of love. In that sense it does not demand anything, it only asks - because the Universe knows best. It can be silent or spoken, but it needs to involve the heart.