One of the things I like best about approaching my fitness and diet from a Primal/Paleo perspective is the amount of time I save in exercise.
Recently, when I don't have a lot of time, I've found that I can jump on a Concept2 rower, and row 5K in just over 20 minutes. This is a challenging workout for me, yet it's over quickly and doesn't leave me sore the next day.
That's what I did last night, instead of doing a tougher workout that might have left me sore or more beat up after skiing all weekend.
If I do this often enough, it would be nice to get my times down under 20 minutes.
And, as soon as my rib is completely healed, I will get back to doing some interval running workouts.
Tonight is CrossFit.