However , the exercise group showed significant improvements in leg muscle strength ( baseline : 41.7 4.3 vs study-end : 64.1 5.0 ; P < 0.001 ) , cardio-respiratory endurance ( 120.5 4.5 vs 105.4 2.8 ; P < 0.004 ) , and leg muscle elasticity and power output ( 21.5 2.6 vs 30.6 2.8 ; P < 0.001 ) .