An exercise designed to strengthen the flexor muscles of the leg WordNet 3.0 & Open English WordNet

The leg curl is an isolation exercise that targets the hamstring muscles. Wikipedia

A weight training exercises Wikipedia Disambiguation

lower limb strength training activity Wikidata

An exercise performed on a machine in which the hamstring muscles are exerted to bend the knee while acting against resistance applied to the lower calf. The exercise may be performed while prone or standing, depending on the design of the machine. Wiktionary