M.P.
want to tone your core, you don't need equipment other than a mat and an exercise ball. There are some really good exercises out there, and one is the Plank. You can do it on the floor, and the ball. There are many positions you can choose to get those tummy muscles toned up with out going broke on the machines. I don't have room for machines, or ability to go to a gym. I hired a personal trainer that brings some things with her, and we do work out for 1 1/2 hour every week. She shows me how to use at home things for work out. I have hand weights up to 20 pounds, big exercise ball, medicine ball, and the Exercise bands (Resistance bands)