AND YET SCHOOLS SPEND THEIR TIME MAKING KIDS SIT STILL: Out of Shape at 18, at Risk for Future Diabetes. “Both low aerobic capacity and low muscle strength at 18 were associated with a higher risk for Type 2 diabetes; poor aerobic capacity was a slightly stronger risk factor. Having both weak muscles and low aerobic capacity more than tripled the risk for future diabetes. The effect was independent of other risk factors — body mass index, family history of diabetes, education and socioeconomic status.”