Don't let anybody tell you, "You can't" just because they can't.
If you're doing it right...
Monday - Strength
Wednesday - Sprints
Friday - Strength
Other days walk, bike, swim, yoga, etc... keep active.
Don't do silly circuits... actually focusing on getting stronger. It would be ideal to be using barbells and following starting strengh guidelines.
Don't jog... actually sprint all out. For sprints, find a nice 50-100 yard hill and sprint up, walk down... 5-8 times.