the best time to exercise is

... whenever you have time.

http://www.heart.org/HEARTORG/GettingHealthy/PhysicalActivity/When-Is-the-Best-Time-of-Day-to-Work-Out_UCM_438922_Article.jsp

The best time to exercise varies for different individuals and depends on personal preferences, daily schedules, and specific goals. It's important to find a time that works best for you in terms of energy levels, availability, and adherence to a consistent routine. However, here are a few considerations to help you determine when may be the optimal time for your exercise:

1. Morning: Exercising in the morning can jumpstart your metabolism, increase energy levels throughout the day, and help establish a routine. It can also enhance mental focus and productivity. To exercise in the morning, try setting your alarm clock a bit earlier to make time for your workout.

2. Afternoon: For some people, exercising in the afternoon is ideal as it aligns with peak levels of alertness and muscle function. It can also provide a mid-day energy boost and help relieve stress from work or other daily activities.

3. Evening: Exercising in the evening can be beneficial if you prefer to unwind, relieve stress, or use it as a way to transition from work to leisure time. It may also help improve sleep quality. However, keep in mind that vigorous exercise too close to bedtime may elevate your heart rate and make it harder to fall asleep easily.

Ultimately, the best time to exercise is when you feel most motivated, energized, and can incorporate it into your regular routine consistently. Experiment with different times of the day to observe how your body responds and find the time that suits you best. Consider factors such as your job schedule, personal obligations, and the availability of facilities or fitness classes during specific times of the day.