Ok, I just realized that I've a running blog but I keep mentioning running over here. So sorry. I'll try to keep that to a minimum in the future.
Anywho, this is an email I wrote to a friend of mine just the other day. Being a nerd, I thought it'd be funny to come up with some sort of formula for the odds of someone becoming a runner. What I didn't anticipate is how far I'd take it. Since I spent way too much time on this email, I thought I'd just go ahead and post it here so that all can marvel (be frightened by) my effort.
How to avoid the running bug. This is a good question. Unfortunately for you, a member of your household has already become infected and while resistance to the infection is usually high even with otherwise athletic individuals, exposure over time has been shown to have devastating effects. Attempts at sterilization have largely proven to be not effective. The only way to successfully avoid an infection is to either 1) remove those infected or 2) hope the infection will wane over time.
The formula for chance of infection is:
(Sum from 0 to n of (t x p x EC)) / (DoE x SC x (a x p))
Where n=number of infected, t=time, p=proximity, EC=Evangelism Constant, DoE=Decay of Enthusiasm, SC=Sedentary Constant, and a=number of antibodies
In your case, you only have one infected person in very close proximity, so that's working in your favor. Likewise, it's hard to tell what K's Decay of Enthusiasm rate may be as this does not usually demonstrate itself until after several months and/or time spent away from running. Newly infected individuals tend to demonstrate qualities of a DoE rate of 0, though this is rarely the case over time. Note, though, that as the DoE rate approaches zero, your chance of infection approaches infinity. Carrie has so far managed to avoid infection for over a year, partially due to my relatively low EC, though my DoE is proving to be a problem for her. I'd say to increase your chances of non-infection, I'd increase the number of antibodies (people who think the infected are mentally incapacitated in some respect) and their proximity. Note, though, that time does not increase the effectiveness of antibodies. In fact, the opposite seems to be true, requiring a continual addition of new antibodies to avoid infection. Scientists are still working on discovering why this property exists.
The course of infection is actually rather slow, though early symptoms are easily identifiable. Symptoms include, but are not limited to, making even empty promises to join the infected, volunteering at races (spectating is, so far, thought to be benign, though there is some debate), and reading running material (books, magazines, online). At this point (Stage 1), infection can still be avoided through increasing level of antibodies or working to improve one's SC.
Stage 2 infection includes shopping for (but not purchasing) running gear, especially shoes, reading about training programs specifically, thinking about signing up for a race. At this point, infection is still reversible, but even the slightest action toward increasing susceptibility will immediately cause a Stage 3 infection.
Stage 3 infection is the beginning of the end. Symptoms include purchasing running gear, signing up for races, or even deciding on a training program. Note that no running has taken place and yet the infection has already become widespread.
Stage 4 is actual running, which may include races at the 5K and 10K distance and is often accompanied by a significant increase in consumption of running-related reading.
Stage 5 is either working to significantly increase either speed or distance to the point where antibodies tend to give up entirely. This includes varying runs to include tempo runs, intervals, and even fartleks. Distances may increase to half-marathon or even marathon levels.
Stage 6 is where finding a cure is beyond hope. The DoE may be above zero, but the infected may do everything they can to keep it low. Symptoms include running so much or training so hard that even other infected people may consider them crazy. At this stage, the infection will usually cause a breakdown of joints and connective tissue to where the body can no longer function as infected. Note, though, that the brain does remain infected, and seeks other outlets (most notably biking) for the infection. Still, this mind-body separation can often lead to other mental illnesses and a breakdown of social functioning.
Hope this helps,
Andy