<span>I believe the answer is: In a controlled and unstable environment at slower speeds
Controlled environment refers to exercies places with full safety regulations intact in order to avoid fatal accidents. The 'slower speed'in this context does not necessarily mean always do low level workout, but we need to maintain our workout level only to reach 70& - 80% intensity most of the time in order to prevent injuries that might mess up your workout schedule.
</span>
I believe the answer is D
The first clause talks about freedom and the rights that come with it. These rights must not step on the rights of others. The second clause exemplifies the law and how no one is above it. The clause about life, liberty and the pursuit of happiness is the counterpart in the Declaration.
