Volleyball sounds like a great workout.
I like the solitude of running, we have beautiful trails in my area.
If I think my running days are over, biking will be next
Volleyball is a good workout, but I do it for fun and social reasons.
If you go running or biking in the woods, make sure to bring your phone.
Bust your ankle running, or crash biking it could be an issue.
Similar to running, swimming puts one in a solo zone if you will.
I daydream when swimming or biking. You hit that rhythmic breath and are in a zone of sorts.