130. Tachanun

22:1 After Shemoneh Esrei, we say Tachanun, which is a prayer of supplication. Tachanun is recited “falling on one’s face” One should not talk about mundane matters in between Shemoneh Esrei and Tachanun.

22:2 At shacharis, when one has tefillin on his left arm, he leans on his right arm for Tachanun. This is done out of respect for the tefillin. At mincha, when one is not wearing tefillin, he leans on his left arm. (If one happens to be wearing tefillin at mincha, he would lean on his left arm for Tachanun – Mishnah Brurah 131:7.)