Winter training can be a minefield if you read too many sources. I bought a couple of programs in the last couple of years to try and structure my training. I dont really follow them any more but what works for me is this.
2 x weight sessions a week. One with 5×5 squats and some upper body work.
The other focusing on deadlifts with some stability work thrown in.
For november and december i dont even look at the bike generally. I run and if the weather is terrible ill use the rower in the gym. Although if the weather is not too shabby il be out.
From jan onwards il start incorporating cycle training on the bike in the gym. I have a few sufferfest videos which takes the boredom away and gives me some structure.
I use a foam roller and stretch at home. Only takes 20 mins a few times a week.
I know a lot of people will disagree with what i do but it works for me and thats all i am bothered about.