When starting an exercise program keep these tips in mind:
Everybody starts at a different fitness level. Don't compare yourself to other people. We all have our own unique body shape, abilities and commitment level.
Move forward from where you are right now. If you want to run two miles without stopping but you're at one mile currently, you need to practice running more. Work towards adding a little extra distance each week until you get to your two miles. This applies to whatever exercise program you would like to do. Work yourself into it. Progression takes time.
Don't exercise intensely every day. I see this all the time, when people begin a fitness program they usually over-do it in the beginning by exercising intensely everyday until they burn out and quite altogether. We don't have to exercise hard every day! Add some moderate walking and stretching between workout days and give your body a chance to adjust. You're in this for the long haul.
Pay attention to how your body is feeling. If you're getting overly tired or overly sore it's time to lay off a bit and rest up. Recovery is good for you so don't take it as being a negative. Do less strenuous work during this time such as easy walking or simple mobility work. You could also take an easy yoga or mat Pilates class. Positive things happen when we allow our bodies to heal and rest a bit. Sometimes what we take out of our fitness program leads to greater results in the long run.
Keep these tips in mind when starting your fitness journey and you'll have greater success sticking to an exercise program. It's good to remember that doing more or too much intensity is not always beneficial for us. Work towards letting your exercise routine become a healthy habit by keeping yourself safe and injury free.
Useful practical information and a workout or two...