I’ve got no numbers to back me up, but the P90X program seems to be working for me:
I had planned to do a 1:00-1:15 treadmill run today. Instead, I spent 2.25 hours clearing my driveway of ice.
The driveway is 85′ by 12-18′ and I had to use 6″ wide flat cutting shovel to break the ice, and then a standard snow shovel to clear the debris.
I approached the chore as a set of intervals: Break up the ice through a section, (high-HR, low duration) pick up the debris (lower HR, core, back & arm work, longer duration).
Came back inside totally drenched in sweat, muscles twitching, with spasms of nausea.
In a word, Spent.
I still hate winter…