The customised workouts are an app only feature, and are not available via the website.
If you don’t have the app yet, you can download it here:
- iOS: https://itunes.apple.com/us/app/28-by-sam-wood/id1343415654?mt=8&ign-mpt=uo%3D4
- Android:https://play.google.com/store/apps/details?id=com.samwood28&hl=en