Exercises to do

My walking has been too slow today.  I have spent much of the day tired.  I think it may have been due to the depression.  I didn't unfortunately take the time to exercise like I should have.  In short, my walking has been way too slow.  I would like to walk faster than I have been.  Maybe I should just take a brisk walk and do some stretches to straighten and strengthen my back and neck.