As stated before, one of the primary hip flexor muscles is the psoas major. This muscle plays a role in core stabilization (something that is needed during running, squatting, and sitting) due to its attachment site at the spine. If there is a lack of core stability or poor movement patterns during these tasks then the hip flexor can become overworked/tired/fatigued (think what happens when your co workers or teammates don’t do their job, you have to pick up the slack and work harder, bringing you more stress and fatigue). It is when the hip flexor becomes fatigued that the sensation of tightness sets in. This is because the hip flexor has to “work harder” to compensate for other muscles not doing their job.
(3) Fats make you fat - yes, dietary fats get stored as fat. This is there place to go. Fat from a meal that isn’t used for energy will be stored. But, that doesn’t mean fats make you fat. The only way fats can make one “fat” is if the fat stored from meals STAYS stored. Otherwise, knows as a calorie surplus. In a surplus, there is no time for fat to be used for energy. In a deficit, fat will be used because you “aren’t eating enough” So yes, fats get stored as fat, but only make you fat if you keep them stored.
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As I mentioned earlier, the exercises that come first in your workout (aka primary compound exercises) should usually be done in the 5-8 rep range. Exercises in the middle (aka your secondary compound exercises) should usually be done in the 8-10 rep range. Exercises done at the end of your workout (which is typically where isolation exercises belong) should usually be done in the 10-15 rep range.
How to do it: Stand with feet just outside the shoulders and hands behind your head. Squat, keeping your knees behind your toes and squeezing your glutes. After holding this position for two seconds, jump vertically. Pull the toes to your shins in midair to prepare for landing. Land in the starting squat position, hold three seconds and repeat for 10 reps. Be sure to land softly, with the hips back and down.
I HATE that the resistance training community can be so tribal. I have been preaching to bodybuilders for years about the benefits of powerlifting, or Olympic lifting or kettlebells or even Crossfit style conditioning and many have been receptive. Learn from each other and achieve levels of fitness you simply could not have otherwise. Don’t brush off bodybuilding wisdom…it could be the missing factor in your program.