If you miss a few days in a row, don’t beat yourself up. Think about why your approach isn’t working and tweak your plan. It may help to write down an action plan. Be specific – if your goal is to walk 20 minutes a day, write down the time of day you plan on walking and how you’ll make it happen (walking on your lunch break, taking an after dinner stroll, packing your lunch the night before so you can walk up earlier to exercise, etc.).