The
law of conservation of energy states, " Energy can
neither be created nor destroyed; rather, it transforms
from one form to another." During the process of weight
lifting energy goes through a series of energy transformations.
For example the energy transformation diagram during a
bench press would look something like this;   This diagram indicates that kinetic energy has been transferred into thermal energy. At the bottom of the lift when the weight is above the chest the lifter has the lowest gravitational energy due to the relatively low height at this instant. When the weight is lifted the gravitational potential energy is the greatest because of the change in vertical height. Thermal energy accounts for the loss of energy in the system. Thermal energy is generated through the heating of the body. It is considered a loss in energy because thermal energy doesn't contribute to lifting the weight. Thermal energy contributes to muscle fatigue and is the reason why our bodies are only capable of a certain amount of repetitions. You can decrease the amount of thermal energy thereby increasing the amount of reps during a workout by looking at oxygen cost during any amount of work.  http://www.wikihow.com/Bench-Press  https://nigerianscholars.com/lesson/converting-and-moving-heat
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