NADI SHODANA PRANAYAMA
Science has proves pranayama really works, but fails to understand how and why it does: http://www.yogameditation.com/articles/issues_of_bindu/bindu_13/nadi_shodanas_influence_on_the_brain http://www.j-pbs.org/pdf/182/subbalakshmi.pdf I have found that doing pranayama with Rings on increase effect of both pranayama and Rings.