No. To successfully complete the challenge, the kick-off with your before photo and the final check-in with your after photo are enough.
Weekly check-ins are optional and are meant to keep you motivated and give you access to ESN discounts.

Yes. You can skip individual weeks.

What matters for the draw is your transformation at the end of the participation period.

Yes, you can invite up to 5 friends within the first 3 weeks (until January 23, 2026).
If your friends complete the challenge together with you, you’ll receive a €5 ESN voucher for each friend.

No, sharing your journey on social media is not required.

However, social media activity is needed to take part in the weekly prize draws.

For the finale, your transformation, your story, and your chosen category are what matter.