Tongue twisters are very tricky to say quickly.
How fast can you say this tongue twister -
'Whether the weather is fine, whether the weather is not, Whether the weather is cold, whether the weather is hot, we'll weather the weather, whatever the weather, whether we like it or not.'
You could try this tongue twister too.
Lesser leather never weathered, wetter weather better.
Perhaps you could record yourself and send the recording into email@example.com. We could see who can say it the quickest.