When the muscle starts to hurt.
When a man is doing heavy work, his body requires more energy to fuel the increased muscular activity and effort. The additional energy is needed to sustain the physical exertion, support muscle function, and maintain overall performance during the heavy work.
Engaging in heavy work can lead to increased energy expenditure, which may result in feelings of fatigue and exhaustion. However, physical activity has been shown to improve overall energy levels and stamina over time, as it can enhance cardiovascular health and muscle strength. It is important to balance heavy work with proper rest and nutrition to maintain optimal energy levels.
An implement is an object for doing heavy physical work such as digging.
It's caused by working the muscle to fatigue and the muscle is trying to recover and the muscle knows that it has to grow to handle what your doing to it so if you keep lifting heavy you will be sore as the muscle keeps growing to handle the extra weight your constantly putting on it.
Yea your using muscle to swing the bat so yes it is work
You need to lift heavy weight to build muscle fast. This means you should be doing weight lifting sets in which you can only do around 6 reps per set.
When you set a heavy bag down on the ground, you are not doing any work on it, as work is defined as the product of force and displacement in the direction of the force. In this case, you are simply changing the bag's position without applying any force over a distance.
shoulder and back
because they work and move automatically
Resistance training works by inducing muscle contraction. Doing this helps build muscles and strength. That is because muscle contraction generates tension on the muscle and forces it to move.
If one muscle is working then the other one would be relaxing otherwise the othr muscle can't work.
To build muscle in your arms, you should lift heavy. Heavy means heavy for you. Then you should eat a lot of food after lifting.