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Register Now for MavUp Development Clinics

Mountainside JBO is excited to partner with GRINDTIME FIT to provide advanced winter training and development opportunities for the 2022-3 offseason training.   

The Strength & Conditioning program will take place starting Nov 14 at Grindtime and will run Tuesday, Thursdays and Saturday for 10 weeks. These S&C workouts will be indoors at Grindtime and will last 1 hour per session, with Grindtime's top trainers handling the sessions.  

Please know that winter training is optional but is also highly recommended for players for attend, so that they can continue to build and/or sharpen their skills during the off-season, leading up to the Spring season. 

If you have any questions about winter workouts or need additional information, please contact us at

We thank you for your interest in Mountainside JBO and we look forward to working with your youth player as they continue their baseball growth and development!

At the conclusion of or GRINDTIME S&C specific program, we will begin offering baseball skill specific clinics and baseball hitting sessions.  So, check back periodically and look out for notices on our social media and leaguewide emails.  


Champions are made in the off-season

A solid and productive off-season baseball training program can make or break your in-season success for the coming year. Once the baseball season is over and you've had time to rest your body, it's time to begin preparing for the next season.   This will come in the way of playing Fall sports such as football, soccer, lacrosse, and a host of other sports.  It also can entail playing a less demanding Fall  Baseball season, as well as strength & conditioning programs.  

The foundation for enhanced success on the baseball diamond in the Spring/Summer is built with a good off-season training program. It's important for baseball players to use the off-season to develop their core strength, increase speed & agility, increase overall body strength with plyometrics and strength building exercises, and  then honing their baseball skills with reps meant to build solid fundamentals.  

While we are big proponents of sport rotation and resting, an off season program need not interfere with other sports you're participating in and/or tax your baseball specific body parts.   A good off-season program will work specifically on skills that don't require continued repetitive stress, such as throwing.  

If you wait until the start of the baseball season to work hard and get better, you're already too late.   

MavUp Your Winter Baseball Workouts!

For youth baseball players the cold rainy winter is the ideal time to focus their efforts on improving their baseball potential by developing muscular strength and explosive power.   These enhanced physical attributes transfer to the baseball field as quickness, speed, bat speed, throwing velocity and overall power.  And provide the tools needed to take one's game to the next level.   At some point, after mechanics get dialed in and improved, only getting bigger and stronger will manifest into bigger hits and more powerful pitching and throws.   As well as the ability to play at  high level for a long baseball season.   Developing resiliency and stamina make a big difference over the long haul.   

Under most circumstances, we encourage youth athletes at JBO age to participate in multiple sports and not specialize too early.   However, that doesn't mean setting a sport aside totally.   Players need to continue to work on S&C and refine their baseball skills.   Even if part time while playing other sports and participating in other activities.   Bottom line, baseball performance in Spring/Summer will never be optimized without a consistent and well structured off-season training, conditioning and developmental program. 

Home Winter Baseball Workout Basics

While there are many good private workout options for youth players in the Beaverton area, a productive home based workout regimen aimed at improvement baseball functional strength and skills is an absolute necessity and should include the following training:

Core Training

Core strengthening exercises are vital to increasing your baseball power, both for throwing and hitting. Start your winter baseball workouts with core training that works the abdominal muscles, the torso, hips and thighs.   There are a host of great exercises that will target these muscles, such as sit-ups, crunches, planks and med ball throws, which build powerful rotational power and speed. Move on to legs with a combination of wall squats and lunges, then work through upper-body push/pull exercises.  A complete development plan will be located in The Dugout-Players tab...


Rotator Cuff Strengthening & Flexibility Work

Arms are our greatest assets in baseball, so it is crucial to take care of and nourish them.   Thusly, doing drills and workouts specifically targeted to strengthen these small, albeit vitally important muscles should be at the foundation of any baseball specific S&C program.   


Is you son looking to get stronger, faster, more explosive and more powerful?

Mountainside JBO  has partnered with GRINDTIME FIT to offer an advanced baseball S&C development program, that will kick off Dec 13th and run through Jan 14th (taking off 2 weeks for Christmas and New Year's Break).

The program will run for 4 weeks- 3 days per week.  

Tues- 6-7 pm

Thurs- 6-7 pm

Sat- 12- 1 pm

Gindtime Fit is one of the top sports trainers in the Pacific NW.  They work year round with top youth athletes, in all sports.   They have created the program Mountainside will offer and their top trainers will lead each session. 

The focus of this 4 week intense training will be to  develop those skills needed by baseball players to  hit the ball further, run faster, and develop more power, whether hitting, pitching, or throwing. 

Get ready for the 2023 Spring season by getting in the best shape possible!

MSJBO has negotiated a low program rate, a fraction of the price of engaging Grindtime privately.  

All workouts will be run at Grindtime's Beaverton Facility:

11000 SW 11th St.

Beaverton, OR 97005

Register Today!

Registration is now live!  Sign up today, clinic size is limited.