Choosing a good personal trainer might take a few days if you have no clue what to look for. A little education and a few interviews are highly recommended. Keep in mind that no matter how good they are, most personal trainers will not be close to you whenever you workout. They might be around while giving some instructions, but they might pay attention to someone else too. Moreover, if you workout in different environments, you should be able to understand all the tips and instructions explained on the phone. Such small details are very important in the long run.