Tempo workouts, speedwork, long runs, not to mention work, family and life in general... how can a runner fit it all in? One time-efficient solution: combo workouts, which blend elements of quality runs to make the most of every minute you have
and building core strength for good posture will help prevent injuries," says Pierce.Here's howAfter doing the envelope run (above), do two sets of the following: 30 seconds each of press-ups, squats and crunches; 60 seconds of planks and calf raises; 90
