Trained is a past tense and past participle for a word "Train."
Train- 1. Teach (a person or animal) a particular skill or type of behaviour through sustained practice and instruction.
2. Undertake a course of exercise and diet in order to reach or maintain peak physical fitness in preparation for a specific sport or event.
3. Point or aim something, typically a gun or camera, at.
4. Cause (a plant) to grow in a particular direction or into a required shape.
5. Go by train.
6. Entice (someone).
Prabh has trained many co-workers.