Leaders need to improve their own communication and also teach soft skills constantly.
So let's look at a common challenge:
"A colleague needs to improve their communication at work."
The way to help them practice:
"Encourage them to share knowledge because their expertise is a safe space."
People (and don't we all) tend to procrastinate on one presentation for months.
Their progress is slower than expected.
On top of it, writing does the same job as presenting - it helps practicing better expressing ourselves.