These muscles are all involved in the action of flexing the hip which is required during squatting, running, and playing sports. Something important to take note of here is that the psoas muscle (part of the iliopsoas) actually starts at the spine and runs down to the hip. It is considered to play a role in spinal stabilization. Common complaints include a pinch/sharp/tight sensation when getting down into a squat, pain in the front of the hip/thigh during running, or sensation of tightness when sitting for long periods of time.
In addition to the HIIT sessions, it’s always a good idea to go for a 30–60-minute walk as many days per week as you can. I recommend getting a minimum of 10,000 steps every day. Use a phone app to track them. If you’re into jogging, swimming, hiking, or some other form of long-duration, fairly low-intensity cardio, that is fine to do as well, and as often as you like.
Now, if you are somebody that is more of the “do-it-yourself” type, check out our self-paced online course, the Nerd Fitness Academy. The Academy has 20+ workouts for both bodyweight or weight training, a benchmark test to determine your starting workout, HD demonstrations of every movement, boss battles so you know when you to level up your routine, meal plans, a questing system, and supportive community.
Why it works: The RDL, as it's known, is primarily a hamstrings move, but it’s also effective in building strength in your glutes, lower back, and upper back. Be sure to feel the "squeeze" in your hamstrings and glutes as you raise and lower the bar. For an even tougher variation that'll also increase your grip strength, try doing tempo RDLs—count a few seconds on your way up, and on your way down.
“Reg Park’s theory was that first you have to build the mass and then chisel it down to get the quality; you work on your body the way a sculptor would work on a piece of clay or wood or steel. You rough it out””the more carefully, the more thoroughly, the better”” then you start to cut and define. You work it down gradually until it’s ready to be rubbed and polished. And that’s when you really know about the foundation. Then all the faults of poor early training stand out as hopeless, almost irreparable flaws. [..]
When it comes to building muscle, there are numerous theories, methods, and preferences. Whether the goal is improved health, aesthetics, performance, or a combination of all three, there is no shortage of advice to help you get there. So much so that it can sometimes become overly complicated and you forget about the basic facts. But, it’s simpler than it seems. 

(1) Water - I drink this all the time. Mainly in the morning. Doesn’t it make sense to hydrate upon waking up? I use to get nauseous, but that was because of a poor “diet”/food choices. Now, it’s like a filtering fluid at this time of day (morning). I drink it all day, but I have like 1 water bottle every hour. It’s easy to remember and to do (well, for me). We should aim for around 100oz of water, consuming all this in one time would suck. So “timing” water (which is a nutrient) is considered “nutrient timing”.
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