I don't see why not; the quick-change periodization of P90X and Chalean Extreme is mostly there to prevent boredom. Bodybuilders (used in the broad sense, to include fitness and figure competitors) usually only change their strategy two or three times a year, or when they plateau. In an average year, they'll have a strength phase (like Burn), a muscle-building phase (Push), and one or more fat-burning contest preparation phases (Lean).
During a muscle-building phase, rest is important to allow for 100% effort on your heavy-lifting days. Taking an extra day of rest or light cross-training during the Push phase seems like a good idea. One thing I wouldn't recommend is going for a serious calorie burn on those non-lifting, non-running days. Recovery is an essential component of progress.
Aaron A. "Standing on the defensive indicates insufficient strength; attacking, a superabundance of strength." -- Sun Tzu
So I went through the last 4 weeks of the Burn Phase (following the 3 day a week Burn DVDs but doing running as my cardio on off days.)
I'm working towards a 5K in February (so the running is a focus for me right now) but I know strength training is critical also. I'm shooting for 5-6 days per week, and was thinking to do 3 running days, 2 Chalean days, and one rest or cross-training day.
That would mean I'd do 2 push DVDs a week rather than 3 in her program. So I thought I'd extend it a few extra weeks to get the same number of workouts per video in - it would just take me a little longer.
Do you think they would be less effective with more 'rest' in between lifting days?
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