You can make a data set using the data.frame() function,
DF <- data.frame(Height = rnorm(50, 170, 5),
Weight = rnorm(50, 55, 5))
If you want to include two distributions within each column, you can use the c() function to combine them.
DF <- data.frame(Height = c(rnorm(50, 170, 5), rnorm(50, 160, 5)),
Weight = c(rnorm(50, 65, 5), rnorm(50, 55, 5))