In general how do many human activities influence the carbon cycle

There are many of them, but the majority come from using fossil fuels to create energy for cars, factories, etc. It releases extra carbon dioxide into the atmosphere which can cause the Earth to gain extra heat.

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)