I have this weird notion that if I am not sweating heavily on the trainer I am not working hard so usually I go the first 45 minutes with no fan and final 45 minutes with fan. When I turn on fan my HR drops and my power goes up which is so nice mentally and physically.

So my question is what gets you the most fitness......riding in cooler temps and producing more power (260-290 watts) or sweating more and producing less power (230-250) when riding trainer?

I also ride outside and in the summer it gets hot so I am always worried that if I only train under perfect conditions real life conditions will mentally crush me.

What is the real answer???

Thanks
David