Is there a single exercise that works the whole body?

No single exercise effectively works the entire body for building balanced muscle. However, compound movements such as deadlifts, squats, and clean-and-jerks are highly efficient as they engage multiple large muscle groups simultaneously. A balanced routine will always include a variety of movements.

Is it better to work out 4 days in a row or every other day?

For a 4-day full-body split, it’s generally better to insert a rest day after two consecutive training days (e.g. train Monday and Tuesday, rest Wednesday, train Thursday and Friday). This structure helps manage fatigue and ensures you perform better in the second half of the week. Working out four days in a row is possible, but recovery can become a serious issue.

What equipment is needed for a full-body workout?

This program is built around standard gym equipment: a barbell, weight plates, dumbbells, a squat rack, a bench, and various cable machines. However, a 4-day full-body workout for beginners or those with limited equipment can be adapted using resistance bands, kettlebells, and bodyweight exercises.

How can you tell if you've overtrained?

Signs of overtraining include persistent muscle soreness that doesn’t go away, a decline in your workout performance, chronic fatigue, irritability, and trouble sleeping. If you experience these symptoms, it’s a good idea to take a deload week or a few extra rest days.