We've discussed how endurance is highly dependent on training VOLUME. It is also, to some extent, related to high levels of GDA or general daily activity. This week's challenge is to accumulate 10,000 steps per day...in addition to your workout. In other words, don't count your training as GDA. Instead, increase your casual walks and chores to get the quota. This has powerful effects on metabolism, body composition, and sleep. And you can't bang our 70,000 steps on Sunday. It needs to be 10k per day.