Top tips here, hadn't seen ticketysplit before.

the gym carpark down our road is frequently full. Why don't they all just bike energetically there, not go in, and just bike straight home again?

Because people go to gyms for social or esteem reasons more than fitness, or simply don't like the cold? But yeah, it's daft, "What would Bill say?" (.. Hicks. Would have been his birthday yesterday)