What's the best exercise routine to gain muscle strength?

yeh your routine is great itll build strength and size...

another thing is youve chosen the best exercises for your biceps.

do what you want ;)

and the one below has said something good- work two muscle groups during your workout

I usually group the muscle groups together, and do back and biceps on one day and chest and triceps on another day. Legs and abs on alternating days. It also is important to use a heavy enough weight. How heavy are the weights you lift? If they are not heavy enough you wont be getting enough resistance to make a difference. It should be just heavy enough to be able to do 10 - 12 reps and feel "the burn" in the muscle you are working out. If you want to bulk up use more resistance and if you want to tone then use less. Hope this helps!

Bench press and squats cover the most muscles in the least amt of exercises!

Your exercise plan is excellent. Your motivation and commitment should also be strengthened. The building blocks of muscle are proteins and water, and also vitamin, mineral, carbs, and fat.

I hope you succeed.

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this will build strength slowly. for fast results, get personal trainers or start bodybuilding.