when you are excersizing
Your muscles work the hardest when you exerciser. This is because the strongest muscle (your heart) begins to pump blood around your body faster making your other muscles work faster too.
the masticles or jaw muscles.
With exercise bands, you can work out tons of muscles. Muscles that you can work out are arm muscles, leg muscles and back muscles. With leg muscles, you can work out the thighs, and calves muscles.
muscles are at work All the time>
muscles work my legs
For some people, you should set out your homework from hardest to easiest because the hardest work takes time to do and the easy work will be finished faster.
The question is not clear. Hardest, as in the most rigid, is a triangular prism (or tetrahedron). Hardest, to work the geometry of, is probably an irregular blob.
sleeping
yes
To work harder than your hardest involves you pushing yourself to the limit, working harder than you ever have before.
A warm up prepares the muscles for work.
SWIMMING