Weight is not affected by tightening your muscles.
why do my leg muscles tighten and in pain when I'm walking
When your muscles tighten they place more stress on your joints. I had a recent surgery because of not stretching with my sport.
To flex your chest, you tighten the muscles that are in that area. This might include your arms or back as well, but you tighten the muscles in your chest and abs.
your muscles tighten up
muscles weigh more than fat.
The muscles constrict (tighten) and then relax to help pump the blood.
it tightens the muscles in its legs causing its skin to tighten up
Loose muscles. There are exercises you can do to tighten the muscles, it will help.
abdominals?
Kegel exercises are said to strengthen those muscles. they use all the muscles in the abdomen and strengthening the muscles makes the vaginal opening tighter.
diaphragm
It is a series of exercises designed to stretch, tighten and tone the muscles of the body.