Tim Struby

Twelve Weeks

In which the author undertakes a grandiose experiment: to discover whether a regularly imbibing, socially smoking, still carousing 37-year-old can transform himself into a competitive athlet

The Core

Unstuck in the middle

The Coach

Utah Jazz strength-and-conditioning coach Mark McKown

The Plan

McKown's 12-week workout plan

The Diet

Registered dietitian Beth Wolfgram on quality and timing of meals