Spirit Commercial Fitness i-Strength Leg Extension / Leg Curl (IS-2003)

The i-Strength series is an innovative line of strength equipment with an electronically adaptive resistance system. Unlike classic machines with weight stacks, the resistance here is motor-based and precisely controlled. The result: an exceptionally smooth, precise, and effective training experience. Thanks to intelligent control and the integrated 10.1" (25.65cm) touchscreen console, training parameters can be precisely controlled, analyzed, and evaluated – for maximum control and efficient, modern strength training.

Advantages of the i-Strength equipment series:

• extremely smooth movements
• instantaneously adjustable resistance
• reproducible training conditions
• significantly more training variety
• no weight stacks – quiet, low maintenance, modern
• extremely even resistance for optimal movement quality
• quick adjustment without repositioning
• measurability & reproducibility of every training session
• versatility: strength, rehab, explosiveness in one device

The 4 training modes at a glance

1. Pure (classic resistance - traditional weight training) - The "Pure" mode corresponds to classic strength training with even resistance. Comparable to classic machines – only more precise and controlled.

Ideal for:

• muscle building (hypertrophy)
• general strength training
• beginners & advanced users

2. Eccentric (eccentric training - increases resistance during the backward movement) - Here, the negative phase (yielding movement) is specifically intensified. Eccentric training is considered one of the most effective methods in strength training. Eccentric strength training is a technique that focuses on the lowering or lengthening phase of an exercise. Often referred to as the "negative" movement. To increase strength, it is necessary to fatigue the muscles. Eccentric training is valuable for achieving muscle fatigue.

Advantages:

• particularly effective muscle building
• higher strength gains
• more intense training stimuli

3. Isokinetic (constant speed regardless of the force exerted) - The resistance adjusts so that the movement is always performed at a constant speed. In isokinetic exercises, the speed of movement remains constant, but the resistance varies. This usually requires special equipment. Effective in improving functional performance and often used to restore mobility.

Advantages:

• maximum control
• high safety
• ideal load control
• Particularly suitable for: rehabilitation, physiotherapy, joint-friendly training

4. Elastic (dynamic resistance - resistance increases with increasing stretch) - The resistance increases progressively – similar to a resistance band. Elastic training is a form of strength training that uses fast-twitch muscle fibers to exert force quickly. Incorporating elastic training increases strength, improves reaction time, and reduces the risk of falls in older people.

Advantages:

• improvement of explosive power
• activation of fast-twitch muscle fibers
• sport-specific training Ideal for: Athletes, Functional Training, Performance Training

Areas of application:

1. Physiotherapy & Rehabilitation

• safe, controlled movements
• ideal load control
• reproducible training programs
• Perfect for medical training concepts

2. Fitness studios & Boutique studios with supervision concept

• modern alternative to classic equipment
• high training quality
• attractive for discerning customers

3. Personal Training

• individual training control
• versatile training methods
• optimal for supervised training

4. Athletes & ambitious trainees

• explosive power & performance
• eccentric training
• sport-specific stimuli

Features Leg Extension / Leg Curl:

• Leg extensions and leg curls allow for targeted training of the front and back thigh muscles while keeping the body stable in the seated position. The guided movement ensures an isolated load on the quadriceps and hamstrings and reduces compensatory movements.
• Intelligent control and integrated 10.1" (25.65cm) touchscreen console
• Quick switching between leg extension and leg curl directly from the seated position enables efficient training of both opposing muscle groups without changing position.
• The optimized pivot point of the machine provides a natural feel of movement for both extension and flexion.
• The ergonomically padded and adjustable seating system allows for correct training posture for different body sizes and increases training comfort.
• Targeted isolation of the quadriceps and hamstrings supports balanced muscle development and stabilization of the knee joint.
• The i-Strength mechanical resistance system enables extremely smooth training.
• Electro-mechanical servo control mechanism offers standard traditional, eccentric, isokinetic, and elastic training.
• The system based on smooth servo motors ensures a frictionless training experience. Through digital load calculation, it offers unparalleled quietness and smoothness that cannot be achieved with conventional weight training.
• Precision engineering. Proven reliability. Tested for 2 million cycles to ensure consistently reliable resistance performance.
• Minimum resistance 8kg – maximum resistance 93kg
• Dynamic color feedback – the integrated LED light bar changes its color dynamically with increasing load, allowing training zones to be instantly recognized.
• Connect App – update your training data – with a simple login to the app, all your training is automatically saved. This visual representation of your progress not only shows your development but also creates a personal "Strength Resume," thus establishing a strong, data-based connection between the member and your facility.
• Real-time monitoring – cloud-based management allows operators to monitor device status and usage load in real-time. This ensures that the devices remain safe and functional at all times without the need for manual checks, while simultaneously significantly increasing operational efficiency through precise data analysis.

Usage: Home use to continuous commercial use, payload: approx. 160kg
Machine dimensions: L166x W141 x H113cm, Weight 158kg
Warranty: 1 year full warranty, 2 years on labor and spare parts (excluding consumables such as upholstery, cables)