Comprehensive fitness involves a mix of strength training for hypertrophy, HIIT for metabolic health, and corrective exercises for postural alignment.
Most long distance runners have very little body fat, but they also have very little muscle. During long distance runs, some of your muscle is metabolized for energy. On the other hand, interval running allows you to burn a significant number of calories without sacrificing your muscle mass.
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The lumbar part of your spine is your low back, and it consists of five vertebrae which are referred to as L1 through L5. The discs between these vertebrae act as shock absorbers, and they also bear a significant amount of your weight.
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