Answer - Emotional fitness is more important.  That's because people who

are physically unhealthy can still be happy - many are - but happiness will

always elude those who are emotionally unhealthy.   How can anyone be happy if they exude negative emotions  They can't.

Yes, good relationships can certainly be enjoyed if one's physical health is lacking.  But if emotional health is lacking, a good, lasting relationship either with another person or with oneself is extremely difficult to actuate and maintain. 
 

While physical health is very important, it is mainly for emotional fitness that The Win-Win Club exists.   However, when relationships go from this  to this physical health can improve too.   That's because of the mind-body connection.  When we are stressed emotionally, our immune system becomes depressed, and we are much more prone to illness.   So physical health (due to a vigorous immune system) is a great reason to pursue emotional fitness.