Job Description. Position: Certified Trainer. Status: Part-Time. Pay: $30-50/hour. Cor4 Fitness is looking for trainers who are not only qualified, but have a back ground in group fitness, motivational, and have the ability to multitask while thinking on the fly. Under most circumstances the trainer will lead an up to 60 minute workout with a pre-determined workout set for the day. Our trainers are required to have an in depth knowledge of most i...