The best exercise is an activity that you enjoy enough to really pursue enthusiastically. Experiment with different forms of activity (cross training). Alternating new activities with old favorites will keep your enthusiasm high. Cross training also helps avoid injury due to repeatedly doing the same activity. Here are some suggestions:
Indoor (Facility) Activities: If the treadmill, stairmaster, rowing machine or stationery cycle doesn't excite you, sample some group activities that strike your fancy. Participate in a group cycling class, beat stress with yoga, find balance with martial arts, stay cool with indoor swimming, or kick some you-know-what with boxaerobics.
For more information: Equipment Dos and Don'ts
At Home Activities: You don't need to join a gym to experience a variety of activities. Your local video store or library will carry a variety of fitness videos that allow you to workout in the privacy of your home. Some equipment may be required, depending on the activity you select. A few inexpensive pieces of equipment include a jump rope, a set of hand weights (preferably with weight plates that you can add and remove), Dyna-Bands or tubing, or a basic step (for step aerobics).
If you enjoy working out at home then you may want to consider investing in a larger piece of equipment such as a treadmill, ski machine, stationery bicycle, or elliptical trainer.
For more information: Buying Equipment for a Home Gym
Outdoor Activities: Outdoor activities abound during all four seasons. Sample the variety of activities available to you. For example, take a hike to enjoy the Fall colors, learn to cross-country ski when Old Man Winter visits, walk among the flowers in the Spring, or dive into swimming during the hot months of Summer. Getting outdoors into the fresh air not only adds variety to your exercise program but it seems to provide an uplifting of one's spirit as well.