2 of your stats are overpowered. Having just one stat in the red cripples your squad. Take them out training, but it needs to be the one that boost the heart stat only. If your squad is capped on points, it will lower the others while raising the heart stat. Your other stats are high enough to take the hit. All 3 stats should be okay after that. If doing that will lower the right stat (I think tactics, been awhile) below the threshhold, then do the training that boosts both the heart and tactics stat. It will lower your strength stat, but not by enough to go below 315.