Here's a simple tip from 'The Biggest Loser's' trainer Jillian Michaels.  She tweeted last night:

Back home. More writing. You guys have any healthy cooking tips you wanna share for the book? I have one for you. Don't buy your produce pre-cut. The air oxidizes the food faster and depletes it's nutrients? Betcha didn't know that. And now... back to work.

To answer a few of your questions - frozen is fine. As for lettuce , pick from the top of the pile. My guy chef Dr. La Puma says that the lights in the supermarket actually help enhance the nutrients in the leaves.

Here's a fit tip from Jillian Michaels from her facebook status:

So much writing to do before shooting today. Here's a fact I just learned from Chef MD Dr. La Puma - if you eat a handful of raw almonds 15 minutes before a meal with trans fats or saturated fats the antioxidants in the almonds can block some of the arterial hardening inflammatory effects of the crap food. But remember - you should be eating that poison anyway!

However, what I think she meant to say at the end is "you shouldn't be eating that poison anyway!"  

My best friend told me about this website called runhundred.com, that provides music based on it's bpm. 

BPM stands for beats per minute.  Another words, the tempo of the music to measure your heart rate -- the faster the music, the more intense your workout.  

Have you ever noticed in an aerobic class the instructor walking up to the stereo to make the music faster?  They are pitching up the music, making the bpm's faster, which makes us work harder.  Notice during the cool down of a workout, the music is much more slower.  

With runhundred.com, you can now choose music that will set the tone of your workout.  So if you're doing a moderate workout, a high intensity workout, or just stretching, you can choose songs that will help motivate you.     

Remember, always be aware of your heart rate and your body when working out.  

Interested in how music effects your workout, read this article, "The Beat Goes On: The Effects Of Music On Exercise."

If you're a postmenopausal woman, you may want to start tai chi as a hobby. Reported from a Chinese study in the December 2004 Physician and Sportsmedicine, tai chi could decrease bone loss in postmenopausal women.

The average age of the 132 women in the study was 54, and all the women were within 10 years of the start of menopause. They were randomly assigned to a control group or to do tai chi for 45 minutes a day, 5 days a week, for 12 months. Bone mineral density was measured before and after the study period.

During the yearlong study, both groups experienced general bone loss, but the rate of bone loss was less in the tai chi group; compared to women in the control group, there was a significant 2.6 to 3.6-fold retardation in bone loss among women who did tai chi.

Resource: Prevention. 

We've all heard this excuse before..."I don't have enough time to work out!" 

Well, that execuse is being thrown out the window - try to squeeze in a few exercises while you get ready in the morning, like these "Hot Squats" (link to watch below). 

Even if you squeeze in 10 minutes of exercises throughout the day, 3 sets of 10 minute exercises = 30 minutes of a workout!  So something is better than nothing. 

Watch how to do "Hot Squats."

Form: Knees over ankle (knee does NOT go past toes), feet slightly turned out, legs wider than shoulder/hip width, squeeze glutes (butt cheeks) as you push up through your heels working your glutes and inner thighs.  

Remember keep your chest lifted and naval pulled up and in toward your spine.  

Basically doing a squat while blow drying your hair!  

Women, in their determination not to bulk up, have a tendency to use weights that are entirely too light, and compensate with excessive repetitions.  Men, on the other hand, tend toward explosive strength, and load too much weight for too-few reps.  Unfortunately, neither method effetively works the muscles.  Not enough weight and you're doing nothing but fighting exhaustion.  Too much, and you're risking serious tears and strains. 

Alternative: Women, use just enough weight to allow two to three sets of 8 to 12 reps, reaching your fail point by the final rep.  Men, use enough to reach fail by the end of two to three sets fof 6 to 8 reps.  

Source: American Fitness Nov/Dec 2008