Your muscles can actually swell up bigger right after just one workout than they do after training consistently for several weeks.

When trained men do strength exercises, their muscles get about 13.5% bigger right after because they fill with fluid. Certain workout styles make this happen more than others.

When you lift weights for a long time, some muscles like your chest can grow bigger than they do right after a workout, but this doesn't happen with your arm muscles like biceps.

Acute muscle swelling responses following a single resistance training session are not representative of swelling responses observed after prolonged, repeated training programs.

If a guy new to lifting weights gets a bigger muscle swell right after his first workout, he’s likely to gain more muscle over the next 6 weeks.

After a heavy leg workout, the thigh muscles get noticeably thicker due to swelling, and this lasts for at least two days.