Should You Approach Sex as a Marathon?

Probably not.

Sex as a marathon "... may not be the solution for every stagnating Marriage." In response to the publication of two books detailing daily sex for two married couples, "Lois Braverman, the president of the Ackerman Institute for the Family, cautioned against couples trying to keep up with the Mullers and Browns. “Some couples are totally satisfied with being sexual one night a week, some twice, some twice a month,” she said. “There’s no number of times that’s right.”

According to another sex therapist and psychotherapist, Shoshana Bulow, "There’s all sorts of reasons people lose interest in sex with their partner — disappointments, life cycles, financial issues,” she said. “Just having it isn’t going to resolve those.”
Source: Ralph Gardner Jr., NYTimes.com, 6/8/2008.

I think the "just do it" mentality has benefits for couples who have a low sex marriage due to busy schedules and tiredness. However, making a pledge to have sex everyday for a year or for 100 days or whatever has the danger of turning the sexual experience into just another thing that has to be done or checked off a to-do list each day.

Full Article:
     Yes, Dear. Tonight Again.

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Related:
     Signs of a Low Sex Marriage
     Book Review: Sex Starved Marriage: A Couple's Guide to Boosting Marriage Libido