Walk

Walking is just as good as running, but you don't exert as much energy. I usually walk an hour a day and try to do 40 laps around the track. Walking is less strenuous and is not as hard on your joints and knees. I'm able to go farther with walking than with running for that reason exactly because it doesn't take as much energy. 

According to Healthline, walking can burn calories, strengthen the heart, lower blood sugar, ease joint pain, boost immune function/energy, improve mood, extend your life, tone your legs and offer creative thinking. ​

Get out there and walk!