I started exercising seriously and regularly 9 months ago, and mostly rely on DVDs. Between purchases and borrowing from library I've tried dozens and plenty of instructors. Some I enjoy more than others but admittedly it's because for the most part they're easier than others. Tracy does not provide that luxury! I like her the best because you EXERCISE and isn't that what you put the DVD in for? Here again we have 20 minute workouts - easy, right? - that have your heart racing and legs shaking 6 minutes in. Three solid weeks of this DVD - and be honest, I'm talking several times a week if not every day - and there's no way you're not going to be admiring your newly toned booty. This is a problem area for me, being pear shaped, and so I opted for this DVD vs. her other new one which concentrates on abs. Everyone can fit 20 minutes into their day, no excuses - and while I don't know that at 52 I'll ever again be bikini bootylicious, I look forward to shaking my newly toned and lifted "groove thing".