In which stage of the transtheoretical model of exercise program adherence must the participant be most vigilant against a relapse into physical inactivity?

In the transtheoretical model of exercise program, the participant must be most vigilant in the fourth (4th) stage against a relapse into physical inactivity because it is the least stable stage. The fourth stage is the stage when the participant has been exercising consistently, but for less than 6 months.

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the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.