Weekly newsletter writer for a fitness coaching business

About us: online coaching, roughly 2,000 subscribers.

What we want: one newsletter a week, 400-500 words, friendly and motivating but not pushy, with one clear call to action. First month = 4 newsletters, then we'd like to continue if it goes well.

We will give you a tone guide and past emails. English must be native-level, please.

Please include a short sample paragraph on 'why most people quit in February' with your proposal.