Kettlebells can replace dumbbells as a new way to get in shape using free weights at the gym. If you're thinking about making the switchover to kettlebells, don't throw away or sell your old dumbbells. With just a few materials and some ingenuity, you can convert your old dumbbells into kettlebells and save yourself some cash. Also, if you decide afterward that you're not happy with the kettlebells, you can simply change them back into dumbbells.
Prime the three 4-inch lengths of PVC pipe and the two PVC elbows using a paint brush and the PVC primer. When dry, apply the PVC cement to the inside of the ends of the two elbows. Attach a 4-inch length of PVC pipe to the two elbows and the remaining two lengths of 4-inch PVC pipe to the other ends of elbows, forming a U-shaped handle.
Tie a hitch knot on both sides of your rope to allow for adjustment around the dumbbell, and tie a figure 8 knot behind the hitch knot as a stopper (see Resources).
Thread the rope through the PVC handle.
Attach the inside handle of the dumbbell to the PVC handle using the hitch knots. Pull the knots tight to ensure they hold during use.