I bought a magnetic cycling trainer thing the other day. You attach your bicycle to it on the rear wheel, connect a roller and it uses magnetic resistance to let you work out indoors. It's shit. I gave it a try today and did not like it. It's noisy and does not feel comfortable at all, nothing like real cycling.
Fortunately for me the day's misery ended in the late afternoon when it stopped raining, so I went out for a proper cycle. I did not regret it. I remembered once again that it doesn't really matter how cold it is outside, as long as it's not raining. Just go out and cycle. It certainly made me feel a lot better after being stuck inside with a cold for 2 days.