Toning vs. muscle mass

You lift weights to gain muscle mass. It's a low impact, high tension activity. The way to promote muscle tone is to do low-medium impact activities that or low tension - ie low strain over a long time. Normally I run, but recently; I dance. Apart from the bruises I find the next day from where I've thrown my arms out and whacked something, it's a lot more fun. Running=constant pain whilst lucid. Dancing=stupid inane movement whilst intoxicated.