I recommend that you choose between two different email platforms depending on your situation: Mad Mimi or Mail Chimp. Below are some of the advantages and disadvantages to each.
Mad Mimi is extremely user friendly and will allow you to quickly create attractive looking emails whether you have graphic design skills or not. It uses a straight forward drag and drop system that can be quickly customized. If you are new to email marketing, this is the easiest solution. It also features a way to quickly design and embed sign up forms within your website.
Mail Chimp may be one of the most widely used email hosting platforms online, especially with small businesses. While it has more features and flexibility for customization than Mad Mimi, the user interface is less intuitive and will take some getting used to. Even so, if you want to look like the bigger players in the fitness industry, you will probably need to use this platform to get the custom feel you’ll want to represent your brand.