You will feel more resistance when trying to push the bike in gear with the clutch pulled in than if the bike is in neutral..........The clutch just disconnects the bikes gearbox from the engine when it's pulled in. So, when pushing the bike in gear with the clutch pulled in, you are still turning some of the cogs in the gearbox, which will offer more resistance than having the gearbox in neutral. If your clutch is badly adjusted it will either slip....which will show up as the engine rev's rising as you open the throttle in higher gears, but the bike's speed not increasing as expected........or the clutch will drag (not disengaging fully).....you tend to notice this as the bike trying to creep forwards when you're in gear but you've got the clutch lever pulled fully in.....or having difficulty getting the bike into neutral when you're stationary. Both these scenarios can be due to a badly adjusted clutch lever, or a problem with the actual clutch itself.....