Bethany walks on the treadmill at least four times per week to maintain her cardiovascular health. lately, she has been finding excuses not to exercise and is starting to miss one or two sessions each week. how can she apply the sport principles to get her workouts back on track? a)she can focus on progression by walking slower for fewer minutes on the treadmill. b)she can take a break from walking for a few weeks in order to prevent reversibility. c)she can start to lift weights while walking on the treadmill to increase specificity. d)she can explore other types of physical activity to combat the tedium of her workout.