Do cardio. To keep healthy, do 30 minutes of cardio, most days of the week
Do strength training exercises. For maximum benefit, do strength training workouts at least 2 days per week 
Find exercise events. Sign up for events that involve walking, hiking, running, swimming, or other physical activities
Get a soccer ball. Kick the ball with your kids, friends and neighbours
Go to the gym. Working out in a gym or health club can give you inspiration, competitiveness, and encouragement
Lift a foot. When you are standing in line, lift one foot and carry all your weight on the other. This helps firm and tone muscles in your legs and thighs
Park on the far side. Park your car on the far side of the lot to get a little extra walking in
Squat more. Instead of bending over to pick things up, bend your knees and squat! This helps you build strength in your legs and thighs
Squeeze your thighs. Every time you are stopped in your car (or sitting on a bus), tense up your buttocks and thighs, then release, and repeat