I am amazed that more people wanting weight loss aren't looking more closely at what Tracy has been doing, from an energy system and calorie burned per minute perpective. Many people have lost 100 pounds or more. Some have even kept it off for two plus years or more. But I surely haven't seen anyone loose 125 pounds and end up to lean and muscular with body fat levels 20 year old females would love to have.
Now I write this NOT because she is my wife and I am proud of her but because as a strength and conditioning professional I am amazed at what I have seen her do with her body with her training and I am intrigued by what is actually happening.
She built up quickly to two minute swing sets, which is a feat in itself, with two minute rest intervals. She started with four work bouts( 8 minutes of actual work) twice a week and built up to being able to do 800-900 swings with the 16 kg in 30 minutes as a throwaway workout- no big deal. or 1200-1600 swings in a hour two or three times a week.
The work( in a physics sense) being done here is off the charts ; and yet it is available to so many. yet so few seem to choose it. It is very hard but ???? It is obviously working.At whatever sport I decided to compete in I always approached it the same way. I started at the top and looked to what the best were doing. I would try to emulate them and build up to what they were capable of.If my goal were to lose a lot of bodyfat and get as lean as possible I would be doing these hellacious swing workouts Tracy is doing. At least I would HAVE to try.Start at the top and work down.
When she started doing them and I noted how well they were working I called them "aerobic threshold" sets. In an energy system sense, under two minutes of work is mostly anaerobic, requiring more white fibers, glucose as fuel and by nature higher intensity.Think sprinting.
Pretty much after two minutes the energy required to keep things going is primarily fueled by the aerobic energy system.The anaerobic threshold is the level one can work at and NOT go into oxygen debt.The aerobic threshold is the level one can work and NOT go aerobic.I'm sure Kenneth Jay can school me on my exercise physiology mistakes but one thing is true: it does work.
SO these multiple two minute work bouts she does is just of short enough duration to keep a high degree of white fibers involved but long enough to start tapping into the aerobic( more fat, less sugar as fuel). That's my theory and boy it sure seems to work.Now that she is doing heavier, shorter work bouts she is not losing weight but gaining muscle. The one to one work to rest ratio keeps the entire time spent training shifted towards the aerobic system so she is as lean as ever. Way cool.I am just suprised more people who's primary goal is weight loss are not emulating her training.