Do you think muscle may be built up in house?

It was a ideal for muscle training 7 to 8 times with 80% intensity until some years ago.

It was famous experiment in 2012, the same result you can get was hit on even roughly 30% in maximum intensity if you do it sufficient repetitions muscle training and you do muscle training in a gym with any equipments.

Resistance exercise load does not determine training-mediated hypertrophic gains in young menWe have reported that the acute postexercise increases in muswww.ncbi.nlm.nih.gov

It was almost same results with muscle gaining in 2015’s experiment.

Effects of Low- Vs. High-Load Resistance Training on Muscle Strength and Hypertrophy in Well-Trained Men - PubMed