Couple's cruise, of a sort

Hoover ___ (Colorado river barrier)3 Negative prefix with "honest" or "proportionate"3 "Be sure to take ___ to your yoga class!" (floor exercise equipment): 2 wds.4 False belief that can be busted4 ___ as a fiddle (very healthy)3 ___ conditioner (clothes softener)6 ___ age (period where Earth's temperature dropped)3 Oolong and chamomile, for two4