Fill out the form below to send a Tell-A-Friend Email about 4 mile Interval training run: 1mile easy, 1 mod. hard, 1 easy, 1/2 mod. hard, 1/2 easy. It's that easy! You can use Friends Lists to manage your Friends. Find all your Friends on MapMyRun.com by searching your Address Books. Please note that you can only send to a maximum of 10 recipients per the open text field.