Physical activities that are equivalent to walking in terms of calories burned include cycling, swimming, and jogging. These activities provide a good cardiovascular workout and can effectively maintain or improve fitness levels. Engaging in low-impact activities like elliptical training or light aerobics can also match the calorie expenditure of walking. The key is to engage in sustained activity that elevates the heart rate and maintains it over an extended period. Each activity offers unique benefits, allowing individuals to select options that align with their interests and fitness goals while achieving similar calorie burn levels.