energy = force * distance, so
energy = mass * acceleration due to gravity * distance.
Say you press 100kg through 0.5m for 10 reps (near the surface of the Earth):
energy =100kg * 10ms^2 *0.5m *10 reps.
=5000 Joules
5000 Joules converts to 1.195 dietary calories. This is the minimum amount of energy required to lift 100kg through 0.5m 10 times. But human muscles are only about 25% efficient, so multiply this by 4. Furthermore pushing weight at 80% of your max uses 12 times more energy than 20% of your max, i.e. your body is only a third as efficient when it is being strained, due to greater demands on your cardiovascular system and more secondary muscles coming into play.
So it is fair to multiply the 1.195kcal by 12 to give about 14 as the number of kcal used during the actual set. Following the set you will have increased respiration and circulatory flow for a while, which uses further energy on top of this.
This is a sound way of solving a question like this.
However, I would be interested in solving the question a different way (and this might make a good high school project).
The calculation above takes
mass * acceleration * distance * reps * best muscular efficiency* 80% efficiency
So 100kg * 10ms^2 *0.5m *10 reps * 4 * 12. What if the muscular effiency is 30%, What if 80% effort results in 14 times more effort, not 12? Big differences result.
So how to test this.
Wear a heart rate monitor for 10 minutes to get a base line heart beat. Then do the set. Record the increase in heartbeat for the next 10 minutes (if the heart beat is not down to resting, use a long enough time frame that it does. Caluclate the energy used by the resting heart, and by the bench pressing heart. Various formulas are available on the internet.
Here is one that seems to be on a number of web sites.
Using VO2max
Men: C/min = (-59.3954 + (-36.3781 + 0.271 x age + 0.394 x weight + 0.404 x VO2max + 0.634 x HR))/4.184
Women: C/min = (-59.3954 + (0.274 x age + 0.103 x weight + 0.380 x VO2max + 0.450 x HR)) / 4.184
Without VO2max
Men: C/min = (-55.0969 + 0.6309 x HR + 0.1988 x weight + 0.2017 x age) / 4.184
Women: C/min = (-20.4022 + 0.4472 x HR - 0.1263 x weight + 0.074 x age) / 4.184
weight is in kg
It is fine to do exercises such as bench press without a spotter if you know what you are doing. I bench press without a spotter and I do fine. It is safer to have a spotter but not necessary.
rugby...playing rugby is similar to doing bech press...
This bench is not designed for the bench press there is no bar to ssuppot the weights for bench press.
The weight conversion ratio between using a chest press machine and performing a bench press exercise is typically 1:1. This means that the weight you lift on a chest press machine should be similar to the weight you can lift when doing a bench press exercise.
http://www.exrx.net/Calculators/OneRepMax.html
doing bicep curls, push ups, the bench press, and chin ups
What's Jamal Lewis's bench press What's Jamal Lewis's bench press
The different types of bench press exercises include the flat bench press, incline bench press, and decline bench press. Each variation targets different muscles in the chest, shoulders, and arms.
The main types of bench presses are flat bench press, incline bench press, and decline bench press. They differ based on the angle of the bench, which targets different muscle groups. Flat bench press works the overall chest, incline bench press targets the upper chest, and decline bench press focuses on the lower chest.
A raw bench press refers to performing the bench press exercise without the use of supportive gear like bench press shirts or wrist wraps. It involves using only a barbell and weights with no additional equipment to assist in lifting the weight.
Bob Sanders can bench 332-pound bench press
he can bench press 225 Tiger woulds can bench press 190lbs.