I wanna say the answer is A I don't really think the other choices would be considered "strengthening activities "
Active aerobics are aerobic activities that are of enough intensity to elevate the heart into the target zone, active aerobics are higher in internsity than lifestyle activities they are also more vigorous and are good for building cardiovascular fitness and providing health benefits
Muscle bundles are coverd in endomysium
Oxygen rich blood to your muscles into the heart pumping and function
