You don’t always need fancy exercise equipment to push your body and build strength. Take the Isokinator Mobile Home Gym for instance. It is a compact fitness device with variable resistances from (0-198 lbs), allowing you to perform 7 exercises and 28 pull & press moves.
The device is easy to use. Simply set a resistance, pull on the short or long straps, and you will have constant tension. You don’t need to rely on dumbbells when you have something like this around. More information is available here.