Training this winter

I mean is putting on lean muscle mass appropriate? Do you have a specific cycling related goal, and how will being heavier help?

Pros:

• standing starts
  
• maximum short term speed, possibly
  
• maximal seated acceleration, possibly
  
  

Cons:

• extra weight slows acceleration, possibly (particularly repeated accelerations)
  
• extra weight slows climbing
  
• increased frontal area increases drag
  
• more calories needed during endurance rides (road based)
  
  

If you're targeting match sprint / team sprint / kilo, then go for it (as long as you're doing even more work on leg speed / technique / stablising core work). If not, it's probably a waste of time, unless vanity outweighs the desire for cycling prowess.