Go Gadgets: Xertube

Be Strong
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Be Strong
Jet-Set Fitness

Xertube

A lifting circuit in a bag. Using resistance instead of weight, you can target your glutes and quads with squats and lunges, your biceps with curls, and your lats with doorjamb pulldowns. To boost your workout, switch resistance levels from yellow (easiest) all the way up to purple. Luggage space: 44—53 inches long, 0.75 pounds info: $5—8; leighcrews.com.