That could be a result of not having the suit pulled on sufficiently in the upper half (which could be because the lower half isn’t pulled all the way on). The whole suit has to be pulled all the way on. If it isn’t it can creat a chain reaction that causes the whole thing to feel like it’s pulling against you. Legs all the way up so that the crotch is snug to the ‘nether region.’ Torso pulled up so that the armpits are snug…along with the arms pulled up. Torso and arms not properly on will cause it to create resistance for your arms and shoulders. — Dan