She is trying to build muscle strength and muscle bulk.
- Rapid repetitions can aid in increasing muscle strength and endurance.
- A faster weight training pace results in more complete muscle engagement. The main purpose of fast lifts is to increase power production or explosiveness.
- On the other hand, slow lifts aid in recruiting more muscle fibers to combat an outside resistance.
- Muscle groups coordinate with one another while lifting weights, and both eccentric and concentric muscle contractions take place at the same time.
- For example, in an arm curl, the bicep muscle shortens (concentric muscle contraction) and the triceps muscle lengthens as we raise the weight toward our shoulder (eccentric muscle contraction).
- Type 2 or "rapid twitch" muscle fibers, which are crucial for generating hypertrophy (muscle growth and size increase) and developing strength, are activated while lifting larger weights.
Therefore, by lifting weights in rapid repetitions, Grace is trying to build muscle strength, endurance and bulk.
Learn more about Muscle Hypertrophy here:
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