<span>A. increase the weight until no more than 20 repetitions and three sets are possible
the concept behind this is called </span><span>Progressive Overload: the human body and the muscular tissue, in particular, must be challenged with an increasing intensity, otherwise, it becomes accustomed to what it is doing. So, if you can complete more than 20 repetitions on three sets, you should increase the weight until no more than 20 repetitions and three sets are possible, increasing in doing so the difficulty of the exercise. </span>
It is true. There heart can get a heart attack if it is very weak.
Participating in extreme sports can help your cardiovascular system work properly and better because extreme sports usually are very taxing in terms of being an aerobic sport which also puts a lot of burden on the aerobic system. Another benefit would be not so health-related but more personal; doing extreme sports and being close to death - which can hppen - makes one more appreciative and aware of life and death.
The consumers who like to eat unhealthy food typically don’t like the healthy snacks survey but consumers that like to stay in shape are most likely going to be more interested.
Hope this was helpful :)