Buddha shared his experience eating one meal a day before noon from [Bhuddali Sutta][1]

>  ...experience few afflictions, few ailments, lightness, ***power***, and a pleasant abiding....

tho in pali, Buddha didn't use Virya, he used "balañca".  I think it matches your question well as it means physical strength. 

  [1]: http://awake.kiev.ua/dhamma/tipitaka/2Sutta-Pitaka/2Majjhima-Nikaya/Majjhima2/065-bhaddali-e1.html