Which of the six main motivating factors in lifetime fitness is most important?

If you are having a hard time lifting something, you should arch your back. a. true b. false

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles.b) the viral genome codes for specialized enzymes not in the host.c) the virus infects only those cells and species that can perform all the replication roles necessary.d) viruses can stay in a quiescent state until the host cell evolves this ability.

Shawn is looking for one-on-one attention from a fitness professional to advance her workouts. which of the following training principles best reflects her needs? frequency tedium specificity overload