To ensure we love Fridays and appreciate our weekends: without a tough Monday we have nothing to compare. To test our grit: can we put aside the grime, the rain, the failures in public transport, the bad news, the water-cooler complaining and still do a damn good day's work? Can we be cheerful for our barista at 0630 who is struggling with a long queue who need-no, demand-their caffeine as one of her team mates couldn't get out of bed and consequently give her hope that there is some justice in the world.
To test you. How professional are you? When the going gets tough....well you know...
To allow a fresh start, a re-boot. To allow you to make a different kind of impact: one for your customer rather than your family. To allow you to get back into the gym after deep muscle rest. To work on your novel at lunch time having done significant editing over the weekend. To catch up with a good friend at the end of the day.
That's what Mondays are for: they are vital to avoid complacency, stagnation and reactivity.