You know it's a good workout when...
...your shoulders get tired of holding the steering wheel while driving back home.
When I have to go into the office I usually head to the gym around 2am and get to work around 4am. But after swimming a mile, running two miles (at a 5% incline, thankyouverymuch), and burning even more time with weights - I learned that the maintenance people did not meet their 3am hot-water deadline; so, now, everywhere I go (at work) smells of chlorine.
Oh, also, the air conditioning at work turns off at night. It turns back on around 7:03am each morning. Meanwhile, it's like 80 degrees in the office thanks to all of the computers. So I sit here in my non-aeron chair, sweating chlorine.
Just two days and seven hours until my 3G iPad arrives - assuming a noon delivery time.