If you haven’t developed a weekly workout routine you adhere to consistently, one way to change that around is by using a monthly wall calendar. This has worked wonders for me and one of the reasons why I regularly repeat my workouts each and every week.
When you have a visual stimulus directly in your line of sight on a daily basis, you get a subtle reminder to stick with your exercise commitment. This is especially helpful when you are first changing your habits to be more health conscious.
On my personal wall calendar, each day I complete a minimum of a one hour workout of any kind, it gets notated directly on the calendar using a bold blue marker. I use the same marker every time so the calendar maintains a uniform look.