(Science Times) Liz Birenbaum, 60, had spent most of her adult life dreading strength training. But this spring, when she was 12 years postmenopause and still navigating symptoms like hot flashes and broken sleep, she found a program specifically designed for women in her stage of life. After being laid off from her job during the pandemic, Birenbaum took up tennis and boxing. Both got her heart rate up, but she knew lifting weights was important for protecting her muscle and bone density.