Please choose the correct ending to complete the given sentence: Health: [header] How to keep a menstrual calendar [title] Get a calendar suitable to your needs. [step] There are currently many different calendar options to track your cycle. You can choose to keep a physical calendar or journal or take advantage of any number of online tools or smartphone apps to track your menstrual cycle.

Ending1: [substeps] On one hand, you can also get a digital calendar for special events or for your wedding. On the other hand, you may order a calendar from a variety of vendors and apps available online. Ending2: [substeps] Calendars are often useful when you are looking to lose weight, compared to electronic calendars. The internet is by far the freshest means of tracking your menstrual cycles. Ending3: Figure out which type best suits your needs and wishes. [substeps] Buy a paper calendar with plenty of space to make notes if you want to document your cycle by hand. Ending4: Try apps like smartcalendar and your smiley calendar. Just refer to the article, " online calendars " or to an app you're interested in.

Answer format: ending1/ending2/ending3/ending4