Safety measures when exercising outdoors include wearing appropriate clothing suitable for weather conditions and using protective gear as necessary, like helmets for cycling. It's vital to choose safe locations, follow prescribed routes, and inform someone about your planned activity. Carrying a cell phone and staying hydrated are necessary precautions. When exercising in nature, awareness of the surrounding environment helps avoid hazards, such as wildlife or difficult terrains. Lastly, always listen to your body, respecting its limits to prevent injuries.