You don't have to kill yourself doing strenuous workouts that leave you unable to move the next day. (That's my preference, but to each his or her own.). You can just add walking to your daily routine.
If you are currently sedentary, just add in a daily walk before breakfast and after dinner. It's cheap and easy. No gym membership required. Cut back your consumption of animal products. Eat more fruits and vegetables and smile!
No...this simple routine won't get you in the best shape of your life but it's a good place to start and will help you live longer and stronger.
It's easier to smile and be happy when you can move around in your life and aren't overweight and in pain.
Once you are up for a challenge, incorporate more intense workouts that make you sweat and swear. I promise it will not only be worth it, it will be fun!