It's normal to feel some resistance. In fact, especially if the oil is cold, a running engine will spin the rear wheel nicely with the clutch lever pulled back. The fluid friction of the oil between the plates will transfer energy. That's easier to do in lower gears that have a greater mechanical advantage.
If you are concerned the clutch isn't releasing fully, a basic adjustment is the setting of the push rod free play. With a cold engine, release the lock nut in the center of the actuator and unscrew the adjuster a couple of turns to guarantee some free play. Then lightly screw the adjuster back in until you feel contact as the adjuster screw contacts the push rod. Then back the adjuster screw one quarter turn to establish the proper free play for the rod to expand as the engine heats. Hold the adjuster screw in position with the screwdriver and tighten the lock nut.