Beginning in the 1300s, Europeans overturned many of the structures and idea of the Middle Ages. How did the printing press contribute to this revolution?
Several copies of any printed material could be distributed quickly and this led to a wider and wider audience . As the reading public increased, education increased, and the people began to question some of the long held tenets of the ruling class.People wanted to know why, then they wanted to know why not?
There is no definate multiple of your bodyweight that you should be able to squat or leg press. It varies from person to person as each individual has a different proportion of fast and slow twitch muscle fibres in their body. Those with more fast twitch tend to have more explosive power, so could leg press say 160kg 4 times at most, however, a person with more slow twitch fibres may be able to leg press 100kg 15 times. Squatting is a compound exercise, and therefore requires a number of muscles to a) provide the motion and b) to stabilize and support those of part a. Typically, you will be able to squat less that when on a leg press because you have the stability to account for. But, squats are a better measure for lower body strength because it requires all of the links to be strong in order to be able to lift safely. For a leg workout in the gym, make squatting the first exercise. This means your legs are completely fresh. Then do the leg press. This is as if you did the leg press forst, you'd be weaker on the squat and may run the risk of serious injury if you get a 'twinge'. Personally, I weight 80KG and can squat 105KG for 12 reps (going so that my hamstrings are parallel to the floor at the bottom of the movement) but can leg press (after squats) 140KG for 12 reps. So from my ability, it would be about 1.4 times the squat. Machines will vary as each has different friction levels and provides a different path of motion for the body to travel.
Start at 19:14 for the second one, unless you want to get an education.
