Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to exercise during a fast [title] Consult your physician. [step] You should see your doctor before beginning any exercise routine, but even more so when fasting. Your doctor knows your medical history and can provide guidelines specific to you.

Ending1: [substeps] If you are taking prescription diet pills, they are likely safe to use during a fast. If you are not certain if you are fit enough to exercise during a fast, make an appointment. Ending2: Ask a doctor about any medications or lifestyle changes that you're still on. [substeps] Your doctor also can suggest medical treatment options. Ending3: Doctors also can be a great resource when creating a plan for which to exercise during a fast. If you are not already on the recommended exercise schedule, schedule an appointment with your physician if you think this may be the best choice for you. Ending4: [substeps] Talk to your doctor about your desire to fast and your exercise plan. They will be able to tell you if this combination is safe and appropriate for you.

Answer format: ending1/ending2/ending3/ending4