What is Zwift ERG mode?

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Tags

1. #smart
2. #modes
3. #define
4. #workout
5. #wants
6. #particular
7. #trainers
8. #forcing
9. #interval
10. #apply
11. #minutes
12. #zwift
13. #watts
14. #which
15. #different
16. #example
17. #literally
18. #resistance
19. #level
20. #while