zingFit is partnered with MailChimp so you can sync your new customers with your MailChimp account.
More than 4 million people use MailChimp to design and send email marketing campaigns. We believe the MailChimp email marketing technology is far superior to ConstantContact. You'll get up to 2,000 subscribers across all lists in your account, and you can send up to 12,000 emails per month without paying a dime (no credit card required).
To set-up a contact form to collect email addresses, follow this MailChimp tutorial. http://kb.mailchimp.com/article/how-can-i-add-my-signup-form-on-my-website/