You CAN get into shape, my friend!
Here's how to progress:
1. Get to the gym. Find a few exercises you can do confidently and safely. When in doubt, start with the easiest ones.
2. Work these hard 3 days a week.
3. Get outdoors on nice days like today and either walk or jog. Find a track or a trail you enjoy.
When we know or suspect something can hurt us (going too far, going too fast. etc.), do the exercise at a level you can handle. My rule of thumb is to feel "effort" but not "pain" (especially in the joints).
4. Reward yourself for a job well done. Today that reward came in the form of a plate of camarones a la diabla. Delicious, but I almost had to call 9-11!
Let me know how it goes. Have a wonderful day!