During a Metafit work out the intense work periods may range from 5 seconds to 30 secs long, and are performed at 80% to 95% of a person’s estimated maximal heart rate, the maximum number of times your heart will beat in a minute without overexerting yourself. The recovery periods may last equally as long … Continue reading Metafit- What is it?? It’s HIIT thats what it is!