Resistance to wearing yoga things back in America (7)
I believe the answer is:
stamina
'resistance' is the definition.
(I've seen this before)
'wearing yoga things back in america' is the wordplay.
'wearing yoga things' becomes 'mats' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'back' is a reversal indicator.
'america' becomes 'a' (common abbreviation - e.g. in organisation names).
'mats' written backwards gives 'stam'.
'stam'+'in'+'a'='STAMINA'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for stamina that I've seen before include "Vigour" , "energy to go on" , "Ability to keep going" , "Ability to maintain effort" , "bottom" .)