Which factor could improve Mrs. Marie's likelihood of adhering to an exercise program?

Joining a group exercise class can significantly enhance an individual's likelihood of adhering to an exercise program. This is largely due to the social support and motivation that such environments foster. Group classes create a sense of community, which can bolster motivation and commitment, making it easier for participants to stick with their fitness routines. Having workout partners can also provide accountability, as members are more likely to show up when others are counting on them. Furthermore, enjoying the shared experience with peers can make exercise more enjoyable, which is crucial for adherence to any exercise program.

In contrast, factors like increased time management skills or working out alone may have varying impacts on adherence but do not inherently provide the same level of support and motivation that group settings offer. While setting financial commitments might motivate some individuals, it does not directly relate to the social aspects that influence adherence to physical activity.