The T-Qualizer t-shirt looks like one of the left overs of the late nineties clubkids. This one features a battery-operated front panel that reacts to the music by the lights flashing like equaliser bars so when the music is pounding, so is your t-shirt. I'm not sure they were that popular back in the day but look at this chap, he's not John Travolta but he sure is having a good time - £19.95 if you must
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From: Top 10 health and fitness gadgets of 2012 (so far)