Difference between Loosen Up and Physical Exertion

LOOSEN UP vs PHYSICAL EXERTION: NOUN

To relax, act less seriously.
To become loose; to loosen
Cause to feel relaxed
Make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
Cause to become unblocked
Become less tense, rest, or take one's ease
Become less tense, less formal, or less restrained, and assume a friendlier manner

Fatten up, Eke out, Morning sickness, Sniff out, Unstuff, Unstrain, Unlax, Make relaxed, Limber up, Decompress, Unbend, Unwind, Relax, Slow down, Warm up

Aerobic, Move around, Leg exercise, Exercise bike, Cardiopulmonary exercise, Limber up, Strenuous, Exertion, Cardio, Treadmill, Aerobic exercise, Physical exercise, Exercising, Workout, Exercise

Wipe away, Make headway, Body odor, Snuff out, Sit tight, Fatten up, Eke out, Morning sickness, Sniff out, Limber up, Decompress, Unbend, Relax, Slow down, Warm up

Good condition, Aerobic, Move around, Leg exercise, Exercise bike, Cardiopulmonary exercise, Limber up, Strenuous, Exertion, Cardio, Treadmill, Aerobic exercise, Physical exercise, Workout, Exercise

Your muscles really loosen up in heated water.
Great reminder to loosen up and have fun!
Do easy stretches to loosen up your muscles.
The straps can loosen up as you drive.
NEVER had one loosen up since I changed.
Turn the speakers up a little louder than you normally would will help loosen up the material.
Things are stating to loosen up as state parks and boat launches open up.
In sum, my internal workplace advice is: open up, loosen up, listen up, speak up, and don't work weekends on anything you don't enjoy.
However, they tend to loosen up after washing up for a few times.
Should I dig up and loosen up the rootball?

Sudden levels of physical exertion can be dangerous.
No commitments involving physical exertion or emotional stress.
The physical demands required by the job, including requirements for strength and lifting, agility, and physical exertion.
Results: Job demand, physical exertion, and physical load were high in all the musicians, but mostly in viola players.
Sport also requires physical exertion, and or physical skill, which by its nature or organisation is competitive.
Physical demands refer to the requirements for physical exertion and coordination of limb and body movement.
PHYSICAL DEMANDS: Job involves significant and concerted physical exertion required for regular prolonged periods of walking, running, stooping, kneeling, crouching, etc.
PHYSICAL DEMANDS: Job involves physical exertion required for sustained periods of light physical activity such as walking, standing, climbing, stooping, or bending.
PHYSICAL DEMANDS: Job involves physical exertion required for sustained periods of light physical activity such as walking or standing.
In other words, if you use a stimulant regularly to increase your physical exertion capabilities, the physical exertion might kill you.