Summary
Lynn, a menopause fitness coach, breaks down sprint interval training (SIT) and why it's particularly beneficial for women in perimenopause and menopause. She explains how declining estrogen leads to muscle loss and belly fat accumulation, and how SIT provides a metabolic stimulus that triggers the body composition changes hormones used to support. The episode covers the practical mechanics of SIT: 10-40 second all-out efforts at 85%+ max heart rate, followed by recovery periods of 2-4x the sprint duration, for a total session of 10-20 minutes after a 10-15 minute warmup. Lynn recommends stationary bikes for safety and shares her own stair-sprinting protocol. She advises 1-2 sessions per week on separate days from leg-focused weight training.
Key Points
- SIT involves 10-40 second all-out sprints at 85%+ max heart rate, followed by rest periods 2-5x the sprint duration
- Total sprint session is only 10-20 minutes after a 10-15 minute warmup
- Studies on 65-80 year olds showed significant belly fat reduction and lean muscle gains from SIT
- SIT reduces cortisol, triggers testosterone and HGH production, and improves insulin sensitivity
- Stationary bikes are recommended for safety over outdoor sprinting
- Benefits include improved cardiovascular health, reduced hot flashes, better cognition and working memory
- Start with just 4-5 sprints and build up; if you can sprint over 40 seconds, you're not going hard enough
- Program 1-2 SIT sessions per week, separate from leg day weight training
Key Moments
SIT burns belly fat and builds lean muscle even in 65-80 year olds
Studies on 65-80 year olds comparing SIT to moderate cycling showed significant decreases in visceral belly fat and increases in lean muscle mass from sprint interval training.
"And sprint interval training, while it may sound wild for like older women to be doing it, it is really beneficial. And particularly with our problem of losing lean muscle mass from our bodies. In fact, they've done studies where they added sprint interval training to"
SIT reduces cortisol, triggers testosterone and HGH production
Sprint interval training breaks the cortisol-belly fat cycle by reducing overall cortisol and stress levels while triggering production of testosterone and human growth hormone, which supports lean muscle gain.
"So what this kind of very intensive sprint interval training does is it reduces your cortisol and stress levels overall. And it also triggers the production of testosterone and human growth hormone. And all that combined actually supports putting on lean muscle. But we need to be pushing our bodies into the red."
How to structure a SIT session on a stationary bike
Practical breakdown of SIT on a stationary bike: 10-20 second all-out sprints followed by double or triple the rest time, starting with just 4-5 rounds and building up. If you can sprint over 40 seconds, you're not going hard enough.
"Your sprint should never be over 40 seconds. If you can sprint for 40 seconds or more, you are not sprinting. You're doing something fast, you know, hard, but it's not maximal."
Programming SIT into your weekly training schedule
How to fit SIT into a weekly schedule alongside weight training: do it on a separate day from leg work, or after upper body training. One session per week is a good starting point.
"And because my sprint interval training sessions are going to involve my legs so heavily, I would not weight train my legs the day before. So probably I would have a leg day, then an upper body day, then my sprint day, then a rest day."
