Below are all the weekly fitness-related challenges published so far.
Bike to and from places. Get around without hopping into a car.
Hold a plank for as long as you can. Test it again one week later and last at least 1 second longer.
Do an exercise that requires equipment.
Get outside and walk!
40yrd dash. Test your speed and get just a sliver faster. Unless of course your technique and
physique is top notch... Then race someone on your level.