You could go for this bestselling leg extension device at Walmart—it's currently over 80% off and doubles as a curl machine. The Syedee Leg Extension and Curl Machine is just $203 right now.

THE LEG CURL is one of the best machines for building hamstring strength and size. If you don't have one handy, though, ...

The leg curl is an isolation exercise that targets the hamstrings by bending the knee against resistance, says Coates. 'It’s ...