The impression I'd had about aqua, aerobic classes, and their underwater peers was that they catered primarily to seniors and injured athletes. This is because they're generally touted as low-impact alternatives to other exercises. And, while this is true, having one's limbs submerged also adds constant resistance to your workout.

On the whole, it's possible that a watery workout will both minimize the impact on your joints and actually increase its intensity. To compensate, the playlist I've put together is a couple beats per minute slower than usual. But don't let the pool or pace fool you into thinking it'll make for a lighter routine.

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1. Def Leppard - Photograph - 124 BPM

2. Orchestral Manoeuvres in the Dark - Speed of Light - 123 BPM

3. Goldfrapp - Ride a White Horse - 123 BPM

4. Janet Jackson - Together Again - 123 BPM

5. John Travolta & Olivia Newton-John - Summer Nights - 124 BPM

6. Shaggy - Oh Carolina - 125 BPM

7. Stone Temple Pilots - Big Bang Baby - 123 BPM

8. Daft Punk - Robot Rock (Soulwax Remix) - 123 BPM

9. Lil Mama - Lip Gloss - 125 BPM

10. Weezer - Photograph - 125 BPM

mc-dj-2009-sm.jpgMC's resident DJ, Chris Lawhorn, weeds through each week's releases to find the best new music.

You can vote on upcoming songs — and hear the tracks that didn't make the cut this week — on his workout music site,

What do you think?