If you answered NO honestly to all the above questions, you can be reasonably sure that you can:
Start becoming more physically active - begin slowly and build up gradually. This is the safest and easiest way to go.
Take part in a fitness appraisal. This is an excellent way to determine your basic fitness so you can plan the best way for you to live actively.
Please note, if your health changes so that you answer YES to the above questions, tell your fitness or health professional.