Depends on what race and race distance(s)you are training for, where you are on the timeline, and what your current workouts include. If going long and weeks away from race day, then inject additional aerobics on the bike and run. Going long and 2-4 weeks out from race day? Add in relatively shorter workouts at above race pace. Purpose is to make your race pace feel comfortable to you, not easy to you (or to others). If racing Oly/Sprint, then inject speed workouts. Again shorter workouts above race pace on the bike and/or on the road running. Learn the difference of half & full race paces compared to Oly & Sprint race paces.
Also, recognize your current workout ratio. If heavy on run, then lean towards more bike clicks. If long on bike, get out the running shoes. If legs are hurting but you need to jump start your anaerobic, then jump in the pool for high turnover, longer recovery intervals. If you experience workout hangovers, then you know you're doing too much.
Since you know when your body is saying to go more, listen and look for it to tell you when to back-off. The weekdays leading up to your race be sure and taper. You want your body asking for more in race week. Be sure to fulfill its request on race day.