How to Choose the Right Weight for Any Exercise

One of the most common gym questions: "How much weight should I use?" Too light and you're wasting time. Too heavy and you risk injury or can't complete the exercise properly. Here's how to find the right weight every time.

The Core Principle

The right weight is one where:

• You can complete all prescribed reps with good form
• The last 2-3 reps feel challenging
• You couldn't do many more than prescribed

If you're supposed to do 10 reps, the 8th, 9th, and 10th should be hard—but doable with proper technique.

For Complete Beginners

Start Lighter Than You Think

Your first few sessions aren't about heavy weight. Goals:

• Learn proper movement patterns
• Build mind-muscle connection
• Avoid excessive soreness
• Build confidence

Rule: If in doubt, go lighter. You can always add weight next set or next workout.

The Empty Bar / Lightest Dumbbell Test

For new exercises:

1. Start with the lightest option (empty barbell, 5-10 lb dumbbells)
2. Do 10-15 reps with perfect form
3. If very easy, increase weight
4. Repeat until you find a challenging but manageable weight
5. Record that weight for next time

First Workout Guidelines

| Exercise Type | Starting Point | |--------------|----------------| | Barbell exercises | Empty bar (45 lbs) or lighter | | Dumbbell exercises | 5-15 lbs per hand | | Machine exercises | Lightest or second-lightest setting | | Bodyweight | Your body |

Add weight gradually over the first few weeks as movements feel natural.

For Experienced Lifters: Finding Working Weight

The 2-3 RIR Method

RIR = Reps In Reserve (how many more reps you could do)

For most training:

• Target: 2-3 RIR
• Finish your set feeling like you could do 2-3 more reps
• Not taken to complete failure, but genuinely challenging

Example: If doing 10 reps, the weight should be hard enough that you could only do 12-13 total if you pushed to failure.

The RPE Scale

RPE = Rate of Perceived Exertion

| RPE | RIR | How It Feels | |-----|-----|--------------| | 10 | 0 | Maximum effort, couldn't do another | | 9 | 1 | Very hard, maybe 1 more rep | | 8 | 2 | Hard, could do 2 more | | 7 | 3 | Challenging, could do 3 more | | 6 | 4 | Moderate, starting to feel it |

Most working sets: RPE 7-9 (RIR 1-3)

Warm-Up Sets Tell You

Your warm-up sets give information:

• If warm-ups feel heavy → reduce working weight
• If warm-ups fly up → working weight is appropriate
• Bar speed on warm-ups predicts working set difficulty

Weight Selection by Goal

For Strength (1-6 Reps)

Target: RPE 8-9 (1-2 RIR) Weight: Heavy—85-95% of max Feel: Very challenging, requires focus and effort

The last rep should be slow but technically sound.

For Hypertrophy (6-12 Reps)

Target: RPE 7-9 (1-3 RIR) Weight: Moderate-heavy—65-85% of max Feel: Challenging, good muscle burn

Should feel hard but sustainable for multiple sets.

For Endurance (12-20+ Reps)

Target: RPE 7-8 (2-4 RIR) Weight: Light-moderate—50-70% of max Feel: Burns, gets hard toward end

Lighter weight, but high reps still create significant fatigue.

For Beginners (Learning)

Target: RPE 5-7 (3-5 RIR) Weight: Light enough to master form Feel: Challenging but very controlled

Focus on quality over load.

The Practical Process

Step 1: Estimate Based on Experience

For a new exercise, make an educated guess:

• Similar to another exercise you know
• Based on muscle group size
• Conservative if unsure

Step 2: Do a Light Warm-Up Set

5-10 reps at 50% of your estimate:

• Does the movement feel right?
• Any pain or discomfort?
• Adjust estimate if needed

Step 3: Increase to Working Weight

Add weight in reasonable increments:

• Barbell: 10-20 lb jumps
• Dumbbells: 5-10 lb jumps
• Machines: 1-2 pin jumps

Step 4: Evaluate First Working Set

After your first real set:

• Could I do 5+ more reps? → Too light, add weight
• Could I do 2-3 more reps? → Perfect
• Could barely finish? → Appropriate or slightly heavy
• Couldn't complete reps with form? → Too heavy, reduce

Step 5: Adjust and Record

Make notes for next time:

• This weight = this many reps at this difficulty
• Know where to start next workout

Common Weight Selection Mistakes

1. Ego Lifting

Problem: Using weight that's too heavy to impress others or yourself Signs: Cheating form, incomplete reps, injury risk Fix: Nobody cares what you lift. Use weight you can control.

2. Playing It Too Safe

Problem: Never challenging yourself, using the same easy weight Signs: Never feel challenged, no progress Fix: Progressive overload requires actual challenge. Push yourself (with good form).

3. Same Weight for Everything

Problem: Using identical weight regardless of exercise Signs: Some exercises too easy, others too hard Fix: Each exercise requires its own weight based on muscle size and leverage.

4. Ignoring Exercise Differences

Problem: Same weight for similar exercises Example: Using same weight for dumbbell press as dumbbell fly (fly should be much lighter) Fix: Isolation exercises use less weight than compound exercises for same muscle.

5. Chasing Numbers Over Quality

Problem: Adding weight at expense of form Signs: Reps getting sloppier, range of motion shrinking Fix: Only add weight when you can do it RIGHT.

Weight Guidelines by Exercise Type

Big Compound Lifts

Exercises: Squat, Deadlift, Bench Press, Rows Weight: Relatively heavy—these use multiple large muscles Example: If you can bench 135 for 8 reps, you might squat 185 for 8 reps

Single-Limb Exercises

Exercises: Lunges, Single-arm rows, Bulgarian split squats Weight: Less than bilateral (two-limb) version Example: If you squat 185 × 8, you might lunge 95 × 8 (or less)

Isolation Exercises

Exercises: Bicep curls, tricep extensions, lateral raises Weight: Much lighter than compound lifts Example: If you bench 135, you might curl 30s, do lateral raises with 15s

Exercises with Long Lever Arms

Exercises: Lateral raises, front raises, reverse fly Weight: Very light—long lever = high torque at low weight Example: Strong lifters often use 10-20 lb dumbbells for lateral raises

Adjusting Between Sets

When to Increase Mid-Workout

• First set was clearly too easy (5+ RIR)
• Form was perfect and fast
• Increase by small increment

When to Decrease Mid-Workout

• Couldn't hit target reps with form
• Fatigue accumulated faster than expected
• Decrease by small increment
• No shame—it's smart training

Expected Set-to-Set Changes

Normal to lose 1-3 reps across sets:

• Set 1: 10 reps
• Set 2: 9 reps
• Set 3: 8 reps

If reps drop dramatically, weight is too heavy or rest is too short.

Recording and Tracking

What to Log

• Exercise
• Weight used
• Reps completed each set
• How it felt (RPE or notes)

Why It Matters

Without records:

• You forget what weight you used
• You can't track progress
• You can't systematically increase

Using Your Log

Next workout:

• Start where you left off
• Try to add weight or reps
• Use data to guide decisions

Special Situations

Coming Back After Time Off

• Start at 50-70% of what you were doing
• Build back over 2-4 weeks
• Don't expect to pick up where you left off

New Exercise You've Never Done

• Start very light
• Focus on learning movement
• Add weight over several sessions

Working Around Pain

• Reduce weight until pain-free
• If can't find pain-free weight, change exercise
• Don't push through pain with heavy weight

Deload Week

• Intentionally reduce weight by 40-60%
• Maintain technique, recover
• Not about finding max challenge

Quick Reference: Starting Points

Rough guidelines (adjust for your strength level):

| Exercise | Beginner | Intermediate | |----------|----------|--------------| | Barbell Squat | 45-95 lbs | 135-225 lbs | | Barbell Deadlift | 95-135 lbs | 185-315 lbs | | Barbell Bench | 45-95 lbs | 135-225 lbs | | Dumbbell Press | 15-30 lbs | 40-70 lbs | | Dumbbell Row | 20-35 lbs | 50-80 lbs | | Dumbbell Curl | 10-20 lbs | 25-40 lbs | | Lateral Raise | 5-10 lbs | 15-25 lbs |

These are very rough ranges—your actual weight depends on your size, training history, and the specific rep range.

The Bottom Line

Choosing weight comes down to:

1. Start conservative (can always go up)
2. Target 2-3 reps in reserve for most sets
3. Perfect form always comes before heavy weight
4. Record and track to guide future sessions
5. Progress gradually over time

The right weight is challenging but manageable. You should feel like you worked, but also like you could do it again with good technique. That's the sweet spot for progress.