In-Season vs. Off-Season Strength Training: How to Use the Gym Year-Round

The weight room can help a baseball player throw harder, hit harder, run faster and stay healthy. But how you train should change with the calendar. What you do in November should look different from what you do in April.

This post explains the big ideas. It is not a program. A qualified strength coach can build one for you.

This post is general information, not medical advice. Get cleared by a doctor before starting a new training program, and lift with qualified supervision.

Is lifting safe for high school players?

Yes, when it is done right. The National Strength and Conditioning Association (NSCA) states that a properly designed and supervised resistance training program is relatively safe for young people and can improve strength and power (NSCA Youth Resistance Training Position Statement). The NSCA’s position on long-term athletic development also says that building muscular strength helps young athletes improve performance and lower their risk of sports injury (NSCA).

The key words are properly designed and supervised. The AAP warns that unsupervised training carries real risks, and that significant injuries are rare in well-supervised programs (HealthyChildren.org, AAP).

The basics that apply all year

The AAP’s strength training guidance for young athletes includes these points (HealthyChildren.org, AAP):

• Warm up and cool down for at least 10 minutes.
• Learn every lift without weight first. Add weight only after your form is right.
• Work all the major muscle groups, including the core, through a full range of motion.
• Include aerobic training along with strength work.
• Do 2 to 3 sets of 8 to 15 reps, training 2 to 3 times a week.
• Increase weight slowly, by no more than 10% per week.
• Avoid one-rep max attempts and maximum lifts before reaching skeletal maturity.
• Stop at once if you feel pain.

These rules are your foundation, in season and out.

Off season: build the engine

The off season is when you have the most time and the least game stress. It is the best window to get stronger. For many Indiana high school players, that is roughly late fall through winter, after fall ball and before spring practice starts. Your team’s calendar may differ.

In the off season, your training can focus on:

• Building strength in the legs, hips, core and upper back. Baseball power starts from the ground.
• Learning and improving movement. Squats, hinges, lunges, pushes, pulls and carries done well.
• Adding power gradually. Jumps and medicine ball throws can come in once your strength base is solid and a coach approves.
• Arm health. Pitch Smart calls for time off from throwing every year (Pitch Smart, Ages 15–18). The off season gym is a good place to build the shoulder, back and core muscles that support throwing, while your arm rests from throwing.

This is the time to train hard and consistently, following the AAP’s 2–3 days a week guidance.

In season: keep what you built

Once games start, your main job is to play well and stay healthy. You are practicing and playing most days, and your body is already under a lot of stress. The goal in the weight room changes from building to maintaining.

In season, that usually means:

• Shorter sessions. Keep the most important lifts and drop the extras.
• Lower total volume. Fewer sets, with good quality.
• Smart timing. Talk with your coach about which days to lift. Many teams avoid hard lifting right before a game or, for pitchers, right before a start.
• Listening to your body. If your legs or arm feel worn down, it is fine to do mobility work instead.

Some players stop lifting completely once the season starts. Then they spend the season slowly losing the strength they worked all winter to build. Short, regular in-season sessions help you keep it.

A simple comparison

Find the right help

The NSCA stresses that qualified professionals are key to good youth training (NSCA). The AAP names the NSCA, the American Council on Exercise and the American College of Sports Medicine as nationally recognized certifying organizations (HealthyChildren.org, AAP). Ask your school’s coach or athletic trainer who they recommend.

Your checklist

1. Know which part of the year you are in.
2. Learn the movements without weight first.
3. Off season: train consistently 2–3 times a week with supervision.
4. In season: keep short, regular sessions and focus on recovery.
5. Stop if anything hurts.

Strong players are not built in a month. They are built over years of smart, steady work.

— Indiana Baseball Hub

Sources

• NSCA: Youth Resistance Training: Updated Position Statement
• NSCA: Long-Term Athletic Development Position Statement
• NSCA: Youth Training and Long-Term Athletic Development
• AAP / HealthyChildren.org: Strength Training
• MLB / USA Baseball Pitch Smart: Pitching Guidelines, Ages 15–18