Your client should get approval from her doctor first before beginning to work out again. My wifes midwife told us a month after as long as there are no complications. Also do not expect to start doing all the exercises and duration where a women left off. Once she gets clearance then he should gradually build up exercise by 10 percent a week or less depending on the person. The personal trainer can coordinate with her doctor to get the best and safest workout. Safety is important so there is no rush to start working out until the body returns to normal which is different from case to case.