Sports bras may not look worn out, but the support and elasticity eventually give out. Champion, a major manufacturer of sports bras, recommends replacing a sports bra after 100 workouts or 8 months to a year of regular use, whichever comes first. But how do you define a workout? One workout may be a 16-mile run, 30 minutes on the stationary bike, or an hour of step aerobics, so some judgment is called for.
Signs that your sports bra is shot:
-You notice that you're bouncing more; the bra doesn't seem to support your chest as well as it used to.
-The elastic on the straps or bottom band is noticeably stretched out and doesn't seem to fit snugly when you put on the bra.
-The fabric is ripped so that underwires are exposed; this will lead to chafing.