After 8 weeks of lifting weights, whether you do chest and triceps together or alternate them with back and biceps, your arms and chest still get noticeably bigger.

If you're a regular gym-goer, doing workouts that group similar muscle moves together or alternate them doesn't seem to make a difference in how much stronger or bigger your muscles get after 8 weeks.

If you're a regular gym-goer, doing workouts that pair similar muscle groups together (like two push exercises) or alternating push and pull exercises both work just as well to build strength and muscle size over 8 weeks.

Whether you do chest and back exercises together or separately, lifting weights for 8 weeks will make you stronger on the bench press and lat pulldown.

If you're someone who regularly lifts weights, doing more triceps exercises each week might help your triceps muscles get a little bigger—but only a little, and not as much as it helps your biceps.

If you take it easy on your weight workouts for a little while during an 8-week training plan, your arm and thigh muscles will still grow just as much as if you kept going full force.