Fall is quickly approaching and it's time to put in some hard work! This week we focus on intensity training which is designed to help increase our Vo2max. Remember that L4 training does not mean all out maximal effort. The best Vo2max building interval sessions are done at 90-92% of max heart rate so we can maintain quality energy throughout the whole workout. Both the Masters and Junior plans recommend two L4 sessions while the Elite plan will include three. In addition we start a 6-week max strength phase. If you are new to NTS we recommend returning to the General Strength Plan for a few weeks before joining our periodized plan.