Trainer: tacx vertex smart, opinions and alternatives

I actually have no idea of my power at all so just randomly guessing and hoping whatever I buy will be high enough.

I wonder what the differences really are between the Flow and the Vortex.

I know diddly squat but I think over a workout you probably wont be doing more than 200-300watts average. you can definitely sprint for 30S at sovereign like 1000w but that isn't particularly useful training IMO. As long as you can do intervals a of X minutes at a high heart rate and intensity then there isn't much of an issue.
 
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