Employees can benefit from cross training by learning new skills. If, as a manager, you feel the need to bring back the vigor of your staff members, then you may want to consider doing this.
People can expand their skills set by cross training. Not only do they learn new skills, but this allows them to explore their options when it comes to their professional growth. Another advantage to employees is that this enables them to boost their resumes.
Doing other work breaks the monotony. It provides people some much needed change, especially if they have been working on the same tasks for years. Working on something new will change their perspective of work and thus provides renewed energy when it comes to performing their tasks.
Some employees like being pushed to their limits. Doing something they are not familiar with would love the opportunity to test their abilities. Cross training can also provide them this.
At some level, conducting cross-training to employees shows that you trust them because you believe in them and their capabilities enough to let them handle new tasks that may not belong to their list of expertise.