Each month iVillage poses a different question to our Dream Team of experts. Here's what we asked this month: What are three things I should definitely be doing at the gym if I have limited time?

Jonny Bowden, MA, CN, CNS
Will you let me have four on my list? If so, here's my favorite time-challenged circuit: After warming up, do a couple minutes on the treadmill at high speed, then some squats, push-ups and crunches. Repeat until you run out of time. You'll be amazed at how effective that can be. In fact, you'll probably be exhausted within 10 minutes.

If it really has to be three, leave out the crunches and do them on another day.

Liz Neporent, MA
It's a question of priorities. Ask yourself: What are the three things I most hope to accomplish by working out? Your answer will determine how you spend your valuable time in the gym.

Let's say, for instance, your goal is weight loss. There's no point in heading for a low-energy stretch class, since that's not exactly the best method for incinerating calories. A sprint or interval workout would be a better use of your time, because they give you the best bang for your calorie-burning buck. For sprint work, start with a slow-paced warm-up of 1 to 5 minutes. Then do a cardio activity such as walking hills, running or cycling at 75 to 90 percent of maximum effort, followed by a 1-to-5-minute easy cooldown. For interval work, alternate 1 to 5 minutes of fast-paced work with 1 to 5 minutes of moderately paced work ‑- and of course don't forget your warm-up and cooldown.