So I didn't intentionally lie about my favourite workout, that one is definitely my favourite on my own workout.
By my favourite workout of the week is my weekly workout with my husband (minds out of the gutter people!).
Once a week we cycle to Centennial Park to do interval training. This morning it was 10 lots of two minutes fast pace, two minutes slow.
On the way to the park we get to chat about stuff and take in the scenery. The workout itself is pretty hard, then the ride home (our cool down) is nice chatting again.
If I was to do this on my own, I'd soon get pretty bored with it, but when my husband's with me, it's always fun, and challenging.