When older women train by pushing or pulling with both arms or legs at the same time, they get better at using both sides together, making their strength more efficient.

Training one arm or leg at a time helps older women build muscle just as well as training both at once—but it doesn’t help them use both sides together any better.

When older women try to push with both legs at once on a leg press or pull with both arms on a lat machine, they’re weaker than when using each side separately—but this doesn’t happen when they extend their knees.

Training one leg at a time makes it harder for both legs to work together at full power, while training both legs together makes them work better together — the way you train changes how your legs coordinate.

Whether older women train one arm or leg at a time or both together, they both gain muscle—just as much as each other—and both are better than not training at all.

Training one leg at a time makes that leg much stronger than training both legs together — even though both methods make you equally strong when using both legs at once.