To gauge the effectiveness of a fitness routine, one can monitor progress through various metrics such as strength gains, endurance improvements, and changes in body composition. Keeping track of workouts, including weights lifted and duration of exercise, can reveal trends over time. Other indicators include increased energy levels, better sleep quality, and overall mood enhancement. Additionally, measurable goals, such as completing a certain number of repetitions or reducing lap time, can provide insights. Regular reassessment every few weeks helps determine if the current routine is effective or if adjustments are needed.