Buy a Ball
Are you looking to buy a ball or mat? Exercise balls are no fad. Exercising with an exercise ball has been proven to assist in strengthening core musculature. So, if you are looking to buy a ball they're also much less expensive than they were years ago. From an economical point of view they are cheaper than a bench, yet can be used in place of a bench. They take up little space and are easily stored.
Try adding some ankle weights, dumbbells and resistance bands to your exercise ball routine too. I include some suggestions on each exercise page. When you buy from Amazon through these links, a few cents from each purchase is collected and used to host this site.
Exercise
Balls
Available in five sizes to fit users from 4 feet, 7 inches tall to 6
feet, eight inches tall, the Exercise Ball is ideal for physical
therapy, yoga, Pilates, and/or for general core strength training. The
Thera-Band Exercise Ball comes with a guide poster detailing 24
exercises to help you get started, as well as two plugs and an
inflation adapter. The ball can be inflated with a standard pump (not
included).This is a professional grade, burst resistant ball. It's a little more expensive, but well worth the peace of mind if you are on the heavy side, pregnant, or lifting weights. Thera-band has an excellent reputation in the physical therapy community.
Bumpy
Ball 
As seen on Dr. Oz. If you don't like the bumps, try the smooth posture ball below.
Posture
Balls
An excellent tool to release muscle tension and improve alignment, posture balls are used to apply pressure to trigger points or tight spots while on the mat or standing against a wall. Two sizes fit everyone. Made of closed-cell EVA foam material that holds it shape.
Exercise
Mat
This quality inexpensive yoga mat is lightweight and durable. It offers
insulation from cool floors and can be rolled or folded for use in
exercises. J Fit yoga mats provide a stable, non-slip surface that
helps you achieve proper alignment to experience the full benefits of
yoga and ball exercises. Made of durable foam with a high tack surface
that provides stability, with a waffle weave for high durability. Sticky skidless surface
Waffle weave pattern
Dimensions: 24“ x 68“ x 1/8“
Small
Dumbbells
Color-coded vinyl coated solid iron dumbell, 15 pound vinyl coated,
color-coded cast iron dumbbells are ideal for upper body exercises, for
physical therapy, or for light workouts. Vinyl coating gives weight a
comfortable feel. If you are looking to buy a ball or weights these are
a good option. Product photo may not exactly match the product offered
for sale.
Larger
Dumbbells
If you want to get a good strength workout at home, but don't have much
space, the Bowflex 552 SelectTech Dumbbells are an ideal solution.
Newly designed, the innovative pair of 552 SelectTech Dumbbells
combines 15 sets of weights into one using a unique dial system. It's
one of the most space-efficient and flexible strength-training options
available with its unique and effective design. With just the turn of a
dial, you can automatically change your resistance on each dumbbell
from 5 pounds all the way up to 52.5 pounds of weight. It adjusts in
2.5-pound increments (up to 25 pounds).
Wrist/Ankle
Weights
Features of the Valeo Adjustable Ankle/Wrist Weights: Adjustable metal
"D"-ring closure system allows weights to be worn on ankle or wrist.
Self-grip closure for fast application. Soft padding for extra comfort.
10 lb. set has removable weight packs for adjustment from 2 - 10 lb.,
and a double-strap closure for a secure fit. Sold in pairs. If you were
to buy a ball these would give you added resistance when performing
upper or lower extremity exercises.
Resistance
bands
The only resistive exercise bands endorsed by the American Physical
Therapy Association (APTA). Ideal for building upper and lower body
strength for rehabilitation or fitness. Whether building strength after
shoulder or knee surgery or improving athletic performance, our bands,
tubing and corresponding resistance exercise programs can be easily and
economically used for any exercise program. The progressive resistance
of our products parallels the basic concepts of building strength and
mobility. As each level is mastered, the resistance can be increased
with ability. The use of elastic resistance rather than weight-bearing
exercises minimizes pressure on the joints and decreases the
possibility of incurring other injuries. They can be used while
traveling, sitting at home or even in the office. Uses for the
Thera-Band Bands include: exercise, gym, balance, fitness, birthing,
yoga, pilates, and stability and resistance.
Bosu
"BOSU" is an acronym for "both sides up".This version of the Bosu is appropriate for everyone from elite athletes to kids to weekend warriors trying to stay in shape, the Bosu balance trainer helps you strengthen and coordinate several major muscle groups, including the muscles you don't see. The Bosu targets your core muscles--the muscles around your abdominal and back area--while you perform a host of different workouts, from squats and bicep curls to lateral shoulder raises and hip extensions. As a result, you not only gain strength, trim, and tone, but also improve your balance and coordination along the way. In addition, Bosu training helps strengthen the mind, with thoughtful movement that requires the participant to not only be physically involved, but also "here and present" with the mind fully engaged. By combining physical and mental focus, Bosu training will boost your performance across a wide continuum of activities, including sports, recreation, and daily tasks.