They certainly are different! Among other things, Vol. 4 is more cardio than strength and is less than 45 minutes long, Vol. 5 has much more emphasis on lower-body strength, and Vol. 6 uses a barbell and has no impact and no floor work.
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--Julie
Surely a person of sense would submit to anything, like exercise, so as to obtain a well functioning mind and a pleasant, happy life. --Socrates
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