Kettlebells are wonderful tools for strength training. There are plenty of cheap ones around. This 6-in-1 kettlebell has a compact design and can have its weight adjusted from 12lbs to 42 lbs. It connects to your smartphone via Bluetooth, so you can track reps, sets, time, and weight used for up to 9 profiles.
This smart kettlebell has a battery that lasts up to 14 days. It comes with an ergonomic handle and doesn’t get in your way as you do your reps. Costs under $400 at this time.[where to find it]