In order of importance. A fan and a mat will improve your sessions more than an expensive trainer upgrade.
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Indoors there's no airflow, so your core temperature climbs fast and power drops. Point one strong fan at your face and chest; add a second from the side for hard sessions.
Protects the floor from sweat, stops the trainer creeping and cuts vibration noise, which matters in flats. Look for at least 6mm thick and 180cm long.
Sweat corrodes headsets, bolts and frames. A sweat net between your bars and saddle catches most of it.
You'll stare at the screen for hours, so put it at eye level and within reach. A standing desk on wheels doubles as a work desk.
Essential for training zones and for smart fans that follow your heart rate. Chest straps are more accurate than wrist sensors.
Levels your bike on the trainer and stops the front wheel rolling. Cheap and easy to forget.
Some trainers don't measure cadence. A small sensor on the crank fixes that.
Small things for long sessions.
Amazon links above go to search results so you can compare current sellers and prices. Check that a mat or riser block fits your specific trainer before ordering.