If one only has the strength or will-power or interest to do one thing, which should it be: Pray (e.g., Shacharis, Mincha or Maariv) or exercise?
For instance, say one comes home from work late one night and only feels up to doing one thing- praying Maariv or exercising. Regular exercise appears to be obligatory (on some level- see Rambam Hilchos Deios Chapter 4). And yet I'd be surprised if any Rabbi told me to choose exercise over prayer (even by Maariv which is a "reshus").
And please don't respond that one should do both- that wasn't the question.