Bosu Half Dome Ball
This is my number one recommended at home exercise device. You can work on balance/stabilization, increase the intensity of your crunches and when combined with a pilates ball an insane push up exercise. The day my personal trainer showed me this device, I went home and ordered on the Internet that day!
My Holistic doctor recommended that I put two Pinky balls behind my back where my adrenals are and lay down for 15 minutes a day in order to help clear out some adrenal congestion. I realized when I got injured this week that laying on Pinky balls is very similar to when when a massage therapist does some deep tissue work. The Pinky balls are only like 4 bucks each so its a really cost effective way to do some deep tissue work everyday at home.
Body Fat % Scales
I use one of these scales everyday to measure my weight and once a week I record my body fat %. It is a must for people who actually want results season to season. The hand held body fat % devices are good if you already have a scale that you like.
BowFlex Adjustable Dumbells
Instead of having to pay for 2 sets of dumbbells ranging from 2 lbs. to 50lbs you can get just 1 pair of the BowFlex adjustable dumbbells. They ma seep pricey at over $400 for a pair, but its cheaper to buy than all the weights and professionally installing a rack to support them. They are so great that when I lent mine to my father to try them, he ran off with them and I never saw them again!
High Density Black Foam Roller
Medium Density Spri Foam Roller