Flexibility:Doing a variety of workouts is great for keeping your body limber and in the best shape that it can be. If you are constantly doing the same type of workout, you are limiting yourself. You'll still be more flexible and stronger than people not doing anything, but I really feel to get the maximum benefits, you need to incorporate different types of workouts.
Strength:When you think strength, you might think of weight training, but variety comes in handy here too. Sure, you will get strong pumping iron, but you also gain strength overall including running, swimming, and even yoga into your fitness schedule. If you think yoga is just for girls or isn't a "real" workout, then you have been misinformed. Check out this video: In The Yoga Studio and tell me that you yoga is to be overlooked.
Shaping Your Body:One of the best ways to get the body that you have always dreamed of is to include variety in your workouts. In this way, you build strength, flexibility, endurance, burn more fat, and really get the tone look that you are looking for. You cannot spot train and melt fat or tone just one area of your body at a time, so by adding variety to your workout routines, you can achieve the thinner tummy or toned arms, while also strengthening your heart, increasing your stamina, and toning your booty at the same time.
So what kind of workouts can you do to get the maximum benefits?
Ideally you would like to have a good blend of these types of exercises:
Strength training: lifting weights, weight machines, pilates, body weight exercises (pushups, squats, etc.)
Stretching: Yoga (there are several different kinds) and stretching
Cardio: running, biking, interval training
HIIT (High Intensity Interval Training): Intervals of strength and cardio moves with very short rests between.
I can't say that one is more important than the other. They all work together to give you the overall effect that you're hoping to achieve. Plus, it's just more fun to have variety and something new to do each day. And always, always remember to warm up, stretch, and cool down before and after your workouts and always drink plenty of water too.