Back to exercise program

As part of the battle to keep from feeling so down with this disease, I have decided to get back to my exercise program although I do realize it will take longer this time around to get back some of my muscle strength.  Last November I was walking on a beach on the Isle of Palms just off the city of Charleston, SC.  Now, I can't make it across my yard (now keep in mind that my yard is 5 1/2 acres and 1300 feet long.  Nevertheless, I used to be able to walk to the back ridge and sit under a tree to watch all the wildlife.  It is so peaceful and serene back there since there is absolutely nothing but woods and pastures.
I think my ultimate goal in exercise would be to be able to once more make it to the back ridge.  The weather has got to settle down soon and decide whether it's winter, spring, or whatever.  Last night and this morning it snowed here in Western PA.