Do you understand how to do that? Do you have a workout an, exercises, schedule, measureable goals as milestones?
Often it's the nebulous goals ("be in great shape") that are hardest to work on, simply because tjey're vague.
Run a 5-minute mile. Or a 2-hour marathon. Climb Whitney. Ride a century. Deadlift 500#. 32" waistline.
Those are specific goals. The list isn'tan encompassing one -- pick one of those, or a congruent set. Bodybuilding or powerlifting and endurance sports tend not to be highly compatible, though strength training, as an adjunct to a primary goal, can help almost any activity. Another key is to pick goals appropriate to your morphology and abilities: smaller, thinner, long-limbed people make better distance runners, larger are better at power/strength sports, including sprint events. High coordination makes skill sports possible, competitive spirit and youth; lacrosse or ice hockey.
Logging can help you discover your interests, strengths, and weaknesses, as well as progress toward goals.
But showing up at the gym with "get into shape" is pretty vague. If you're starting at a tyical baseline, almost any introductory fitness programme incorporating strength and cardio will benefit.
Group, team, or club activities are another option.