Injury to your calf muscle can occur when you fail to warm up before an activity, especially if it’s an activity you’ve never done before. Typically your calf muscles are tight. If you suddenly force them to lengthen and overstretch, an injury is likely.
Injuring the calf muscle is not uncommon in sports like tennis, running, and soccer which involve a sudden burst of speed. But they also can occur when your muscles are tight and you suddenly run to catch the bus or jump out of the chair to get your phone for example. It’s the abrupt action that results in the injury.