De fleste mennesker ved, at det er meget vigtigt at have en sund hjertefrekvens. Man ønsker ikke, at hjertet slår for hurtigt, og man ønsker heller ikke, at det slår for langsomt.
Overvåg dit Helbred
Members Only 
Sorry, only members can access the video embed code and download the videos :( - if you are a member you will need to login to access the code and downloads.