That and core work. Hubby had issues wearing a Camelbak while mountain biking...his back really seized-up (and he's not prone to back issues, either). I think he realized how important regular core work is.
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Yoga works the core (as well as those all-important stabilizer muscles) very strongly!
Yep...the upper-body weight workouts I do incorporate a mix of yoga poses and more traditional crunch type stuff, as well as work with stability ball and free weights. Good stuff. My abs usually feel pretty tight for a couple of days afterwards. Just doing free weights work with good form works the core, too. Hubby doesn't do any of this...yet! ;)