Possibility of having too much muscle mass in soccer

[Cheezus]

Is it possible to have too much muscle mass without using steroids, which could negatively impact sport performance on the field in soccer?
Second question - how many times a week soccer players should do ressistance training offseason and onseason? Is it possible to plan a workout routine if a player have a time to train at the gym only once a week?

[Jordan Feigenbaum]

Anything is possible, Cheezus. That said, it is unlikely that someone is carrying too much lean body mass for a specific sport or, more correctly, a specific position in a specific sport, without taking specific steps to obtain that.

I think soccer players should resistance train 2x/wk during the season if they're practice and game loads aren't extremely high. During those periods, e.g. a tournament or something, maybe 1x/wk.

What level of soccer are you playing and how jacked are ya?

[Cheezus]

I have clients who play soccer, youth athletes about 14 years old. Usually they have trouble with technique with basic barbell exercises like squat deadlift, press or bench press. It's difficult to teach them if their gym training frequency is so rare. When they are onseason my boss expect from me to do speed work with them, but if they can't even squat I'm affraid that it would be silly to teach them barbell exercises with high velocity. So, in this case what can I do with them?

[Jordan Feigenbaum]

I probably wouldn't do dedicated high velocity work in the gym with someone who was relatively untrained and getting exposed to lots of high velocity sports-specific work during practice/competition (e..g in season).

That said, there are plenty of bodyweight or medicine ball exercises you can do at high velocity, though again, caution should be undertaken when introducing this as they'll need a decent on ramp here.