One effective way to measure workout intensity is through the use of the Rate of Perceived Exertion (RPE) scale, which allows individuals to assess how hard they feel they are working on a scale of 1 to 10. Additionally, heart rate monitors can provide objective insights into exercise intensity; targeting a specific heart rate zone can help gauge effort. Monitoring breathing patterns and the ability to hold a conversation during workouts can also indicate intensity levels. Using these tools can help optimize training strategies and improve fitness outcomes.