When it comes to picking a training program it all depends on your goals. If you are looking to put on a lot of muscle mass, bodybuilding and powerlifting is usually the way to go. If you are just looking for overall conditioning and staying healthy, you should probably look to doing regular full body weight training and low-intensity steady state cardio (LISS) workouts 2-3 times per week. If you are somewhere in between or looking to improve your athletic performance, circuit training is a very good choice.
Circuit training, when done correctly, is one of the most beneficial ways to get in shape and improve your athletic performance. These workouts are formatted such that you have a series of exercises that you do back to back without resting in between and go through them all for a certain number of rounds (a.k.a circuits). A good circuit training workout is usually a combination of strength, cardio, and agility and about 20-30 minutes long. Also, these workouts can be done anywhere both indoors and outdoors as long as you have room to lay out any equipment being used. I would recommend a circuit to include at least two of each type of exercise (strength, cardio, agility) with a 2-3 minute rest afterwards before repeating the circuit again. The strength exercises usually include mostly bodyweight exercises such as pushups or suspension trainers like TRX because these are easy to do just about anywhere whereas dumbbells and barbells are difficult to transport and are usually used in just a gym environment. Then, the cardio portion can include exercises such as high knees, butt kicks, shuttle runs, and mini-sprints. Finally, the agility part of a circuit workout can include exercises such as jumping over mini hurtles, hopping on and off of benches and as well as many others varying in level of difficulty and complexity.
I don’t think circuit training is right for people that are just looking to stay in shape because circuit training is usually very high intensity and involves more complex movements than regular weight training. It is recommended that you get into decent physical condition before starting circuit training purely because of the complexity of the exercises that these workouts can potentially have you doing. For more information, check out the this website: https://www.sport-fitness-advisor.com/circuit-training.html