By clicking on 'Gyms & Teams' from the nav menu under MANAGEMENT
Select the Gym or Team you would like to send invites for by clicking on the gym or team listed
Select 'Invitations' from the Gyms & Teams management view
By clicking 'Invite Athletes' you will be able to enter the email addresses you would like to receive invites. Select the 'Tracks' you want your invitees to become members of before clicking 'Send Invitations'