What is the benefits of "Namaskar"?

Space Between The Palms
For a seeker at the primary level, it is advisable to leave space between the palms; it is not necessary for a seeker at an advanced level to leave space between the palms.

After joining the palms, bow a little. This posture puts pressure on the navel and activates the five vital
energies situated there. Activation of these vital energies in the body makes it sensitive to accepting sattvik frequencies.