When we think of modifications it is often from a specific point of view.... “I have something going on that makes my usual practice/workout painful or inaccessible, so how do I work around it”. When a trainer or instructor first learns how to teach or train they generally will learn about common conditions and how they effect the body, and specific ways to 'modify' to those conditions. This is all very helpful.
I love fit bits for my clients. Here is some extended information you may want to consider when you are tracking your physical activity. You all know I always look at the holistic picture. wink emoticon Enjoy!Stepping Out of Fitness Reductionism
There is a lot of specialization in exercise classes. Sometimes the specialization is in what effect one wants: cardio for strengthening the heart, weight training for strengthening the musculoskeletal system, core for, well, the core, and so on. Sometimes it is in style: zumba and spin both are cardiovascular (though of course with strengthening and sculpting effects), but quite different in style. Sometimes it is in target population: zumba gold targets an older exerciser, as does fit for life, though the music and movements will be different.
All people get older. That is a baseline of the human condition. But although the effects of age, broadly speaking, are part of the life cycle, how quickly and how much they develop is variable. We cannot change our DNA (yet). Some people have greater risks for heart disease, or cancer, for instance. But lifestyle choices can have an enormous impact across our lives on how we age, and even the way genes are expressed can be affected by those lifestyle choices.